Questions about upgrade from iphone 3gs to iOS4.

hello.
Anyone of you guys know that if my current 3gs is upgraded to the new iOS4, can all my apps from 3gs be able to work on the new iOS4?
Also is the battery features from the iOS4 apply on my current 3gs?
thanks!

can all my apps from 3gs be able to work on the new iOS4?
Most of the Apps should continue to work fine, or be updated soon to work with iOS 4. Developers have had access to it for a long time, giving them chance to update their Apps if necessary.
Also is the battery features from the iOS4 apply on my current 3gs?
What battery features?
Nothing is shown here: http://www.apple.com/iphone/softwareupdate/

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