Documentation differences between LR 4 and 5 SDKs

Question

Here's what the Readme says:
     For this release (5.0) the SDK highlights the following:
1. Create Floating Windows: With the addition of LrDialogs.presentFloatingDialog(...)
          SDK developers are now able to create separate, floating, non-modal windows that
          allow more robust interactions between the plug-in and Lightroom.
2.          Access Smart Previews: Smart Previews can be built and deleted via
          photo:buildSmartPreview() and photo:deleteSmartPreview() respectively.  In addition,
          SDK developers can access the Smart Preview path on disk and file size via
          photo:getRawMetadata(...)
3.          Create Virtual Copies: Virtual copies for one or more images can now be created via
          catalog:createVirtualCopies(...)
4.          Retrieve Smart Collection Search Descriptions: The search description for a Smart
          Collection can now be accessed via collection:getSearchDescription()
5.          Create Bezel Overlays: LrDialogs.showBezel(...) will show a message in a window that
          will display and fade away after a short duration.
6.          Request Jpeg Previews: LrPhoto:requestJpegThumbnail(...) retrieves a  jpeg preview
          of the photo of the requested size
7.          Key Bug Fixes and JDI’s:
          -          LrView:catalog_photo(...)’s "photo" argument can now be set to "nil" in
                    order to specify no photo is to be displayed
          -          LrCatalog:getActiveSources(...) now returns defined constants for special
                    sources (e.g. "All Photographs", "Previous Import", etc.)
          -          LR_LiveName propery now available to smart collections
          -          Horizontal and Vertical scrollbars can now be disabled on a
                    LrView:scrolled_view
          -          LrView:simple_list now properly supports enabled and visible properties
I can't determine what is meant by "LR_LiveName property now available to smart collections".
I did a "diff" between the documentation for LR 4 SDK and LR 5 SDK.  Here's what I found:
LrCatalog
catalog:buildSmartPreviews() [new]
catalog:createVirtualCopies() [new]
catalog:findPhotos() [can’t determine the exact difference]
catalog:getActiveSources() [corrected documentation]
LrCollection
collection:getSearchDescription() [new]
LrDialogs
LrDialogs.presentFloatingDialog() [new]
LrDialogs.showBezel() [new]
LrHttp
LrHttp.post() [corrected documentation]
LrHttp.postMultipart() [new parameter, suppressFormData]
LrPhoto
photo:buildSmartPreview() [new]
photo:deleteSmartPreview() [new]
photo:getRawMetadata() [new key “smartPreviewInfo”]
photo:requestJpegThumbnail() [new]
photo:setRawMetadata () [can’t determine the exact difference]
LrPublishedCollection
pubCollection:getSearchDescription() [new]
LrTasks
LrTasks.execute() [explanation of Mac OS sandbox restrictions]
LrView
[explanation that a factory object can only be used in one place at a time]
viewFactory:catalog_photo() [can’t determine the exact difference]
viewFactory:scrolled_view() [new parameters background_color, horizontal_scroller, vertical_scroller]

Answer 1

LR_LiveName is the name of the published collection/set in the rename/edit dialog. See viewForCollectionSettings.
"LR_LiveName will be kept current with the value displayed in the name field of the dialog during the life span of the dialog. This enables a plug-in to add an observer to monitor name changes performed in the dialog."