When I launch iCal (on the latest version of Apple's OS-LION) - it gives a dialogue "Upgrading iCal Calendars" that does not go away.

For the record, on Snow Leopard I deleted ICal since it crashed all the time and was useless.
MacBook Pro Core 2 Duo 2.4 GHZ 2MB Ram

Historically Apple has sold OS X upgrades via DVD media however with the advent of the Mac Apple Store that throws another possibility into the mix. That's about as much as I can say as these forums don't allow us to speculate about future products. As for the cost historically Apple has priced OS X upgrades between $29-$129, the last upgrade (Snow Leopard) was only $29 but that was an exception. Again we cannot speculate on these forums about that. The good news is that Apple is unlike Microsoft which makes OS upgrades expensive and complicated. The choice with OS X is do you want a server version (most users don't need one) or a single computer license. The users that buy server versions tend to have a number of Macs they manage from a server, most consumers don't have this issue.
Keep reading the news, as you know Apple has announced a Summer release for Lion.
Upgrades on OS X are usually very simple. I've upgraded from Tiger to Leopard to Snow Leopard and each transition has been very easy. With any major OS upgrade there are some basic rules to follow, for example always, always, always backup prior to any update. When Lion is released to the general public post again for what to do to prepare or even do a Google search on "How to prepare for OS X upgrade" and you will find a number of articles that will provide some suggestions and valuable insight. You can also re-post here and users will be happy to assist.

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              iMac (27-inch, Late 2012)
              iMac - model: iMac13,2
              1 3.4 GHz Intel Core i7 CPU: 4 cores
              8 GB RAM
    Video Information:
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    Audio Plug-ins:
              BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
              AirPlay: Version: 1.9 - SDK 10.9
              AppleAVBAudio: Version: 2.0.0 - SDK 10.9
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                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) /: 999.35 GB (698.05 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
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              HGST G-Drive Mobile USB 1 TB
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                        Apple, Inc Apple Keyboard
              Apple Inc. FaceTime HD Camera (Built-in)
              Apple Inc. MacBook Air SuperDrive
              Apple Inc. BRCM20702 Hub
                        Apple Inc. Bluetooth USB Host Controller
    FireWire Information:
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              Newer Technology, Inc. Oxford ATA Device 00 800mbit - 800mbit max
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                        disk3s2 (disk3s2) <not mounted>: 29 KB
                        disk3s3 (disk3s3) <not mounted>: 29 KB
                        disk3s4 (disk3s4) <not mounted>: 29 KB
                        disk3s5 (disk3s5) <not mounted>: 29 KB
                        disk3s6 (disk3s6) <not mounted>: 262 KB
                        disk3s7 (disk3s7) <not mounted>: 262 KB
                        disk3s8 (disk3s8) <not mounted>: 262 KB
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              Newer Technology, Inc. Oxford ATA Device 00 800mbit - 800mbit max
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                        Mini Stack (disk2s2) /Volumes/Mini Stack: 999.86 GB (470.15 GB free)
    Thunderbolt Information:
              Apple Inc. thunderbolt_bus
                        Apple Inc. Thunderbolt to FireWire Adapter
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              com.AmbrosiaSW.AudioSupport          (4.1.2 - SDK 10.6)
              com.netralia.driver.VBMicDriver          (1.0.0 - SDK 10.7)
              com.netralia.driver.VBSpeakerDriver          (1.0.0 - SDK 10.7)
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              [loaded] com.adobe.fpsaud.plist
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              [failed] com.google.GoogleML.plist
              [loaded] com.google.keystone.daemon.plist
              [loaded] com.microsoft.office.licensing.helper.plist
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              [invalid] com.oracle.java.Java-Updater.plist
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              DivX
              Flash Player
              Flip4Mac WMV
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              Google Earth Web Plug-in: Version: 6.2
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              Musicnotes: Version: 1.17.3
              OfficeLiveBrowserPlugin: Version: 12.3.5
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              FlashPlayer-10.6: Version: 12.0.0.39 - SDK 10.6
              DivXBrowserPlugin: Version: 1.4
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              googletalkbrowserplugin: Version: 4.9.1.16010
              QuickTime Plugin: Version: 7.7.3
              AdobePDFViewer: Version: Unknown
              Photo Center Plugin: Version: Photo Center Plugin 1.1.2.0
              Silverlight: Version: 5.1.20913.0 - SDK 10.6
              ContentUploaderPlugin: Version: 1.2
              JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
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              Move_Media_Player: Version: npmnqmp 071505000006
              WebEx: Version: 1.0
              MRJPlugin: Version: 1.0-JEP-0.9.0
    Bad Fonts:
              None
    Old applications:
              Audiogalaxy Helper:          Version: 3 - SDK 10.5
                        /Applications/Audiogalaxy Helper.app
              Disc Cover 3:          Version: 3.0.10 - SDK 10.5
                        /Applications/Disc Cover 3.app
              Epson Printer Utility 4:          Version: 9.14 - SDK 10.5
                        /Library/Printers/EPSON/InkjetPrinter2/Utility/UT4/Epson Printer Utility 4.app
              Keynote:          Version: 5.3 - SDK 10.5
                        /Applications/iWork '09/Keynote.app
              Kies:          Version: 2.1.0.13071_1 - SDK 10.5
                        /Applications/Kies.app
              Microsoft Alerts Daemon:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Alerts Daemon.app
              Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4
                        /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
              Microsoft Chart Converter:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Chart Converter.app
              Microsoft Clip Gallery:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Clip Gallery.app
              Microsoft Database Daemon:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Database Daemon.app
              Microsoft Database Utility:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Database Utility.app
              Microsoft Document Connection:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Microsoft Document Connection.app
              Microsoft Error Reporting:          Version: 2.2.9 - SDK 10.4
                        /Library/Application Support/Microsoft/MERP2.0/Microsoft Error Reporting.app
              Microsoft Excel:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Microsoft Excel.app
              Microsoft Graph:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Graph.app
              Microsoft Language Register:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Additional Tools/Microsoft Language Register/Microsoft Language Register.app
              Microsoft Office Reminders:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Office Reminders.app
              Microsoft Outlook:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Microsoft Outlook.app
              Microsoft PowerPoint:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Microsoft PowerPoint.app
              Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4
                        /Library/Application Support/Microsoft/MERP2.0/Microsoft Ship Asserts.app
              Microsoft Upload Center:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Microsoft Upload Center.app
              Microsoft Word:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Microsoft Word.app
              My Day:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/My Day.app
              Numbers:          Version: 2.3 - SDK 10.5
                        /Applications/iWork '09/Numbers.app
              Open XML for Excel:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Open XML for Excel.app
              Pages:          Version: 4.3 - SDK 10.5
                        /Applications/iWork '09/Pages.app
              SLLauncher:          Version: 1.0 - SDK 10.5
                        /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
              Senuti:          Version: 1.2.9 - SDK 10.5
                        /Applications/Senuti.app
              Solver:          Version: 1.0 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/Add-Ins/Solver.app
              SyncServicesAgent:          Version: 14.3.1 - SDK 10.5
                        /Applications/Microsoft Office 2011/Office/SyncServicesAgent.app
              TechTool Deluxe:          Version: 3.1.4           - SDK 10.4
                        /Applications/TechTool Deluxe.app
              TurboTax Home Business 2011:          Version: 2011.r15.011 - SDK 10.4
                        /Applications/TurboTax Home Business 2011.app
    Time Machine:
              Skip System Files: NO
              Mobile backups: OFF
              Auto backup: YES
              Volumes being backed up:
                        Macintosh HD: Disk size: 930.71 GB Disk used: 280.61 GB
              Destinations:
                        iMac Backup [Local] (Last used)
                        Total size: 931.19 GB
                        Total number of backups: 31
                        Oldest backup: 2013-12-19 05:31:29 +0000
                        Last backup: 2013-12-26 15:57:21 +0000
                        Size of backup disk: Adequate
                                  Backup size 931.19 GB > (Disk used 280.61 GB X 3)
              Time Machine details may not be accurate.
              All volumes being backed up may not be listed.
    Top Processes by CPU:
                   2%          EyeTV
                   1%          WindowServer
                   1%          Google Chrome
                   1%          EtreCheck
                   0%          AddressBookSourceSync
    Top Processes by Memory:
              328 MB          thunderbird
              213 MB          com.apple.IconServicesAgent
              205 MB          mds_stores
              197 MB          iPhoto
              164 MB          Google Chrome
    Virtual Memory Statistics:
              2.81 GB          Free RAM
              3.50 GB          Active RAM
              778 MB          Inactive RAM
              948 MB          Wired RAM
              499 MB          Page-ins
              0 B          Page-outs

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