I don't know much information about iCloud but |D| refers to documents directory on iOS. Therefore it should be possible. Maybe someone that knows UIDocument class can enlighten us more.
There are certain features, that Publisher asks...for example what about Facebook Integration? Login in with FB Account and then having the game posting on the Player page would help a lot in terms of marketing as you know...
Today we'll be releasing a new version that addresses a couple of bugs. And then we'll be starting to implement new features which also includes facebook integration.
AFAIK - iCloud syncing is done by a system daemon running in the background on iOS . To implement it each app has an iCloud directory in addition to it's documents directory, any content in the iCloud directory is backed up by the daemon at some future point.
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There's a lot of info on Ray Wenderlich's site...
http://www.raywenderlich.com/12779/icloud-and-uidocument-beyond-the-basics-part-1
http://www.raywenderlich.com/12794/icloud-and-uidocument-beyond-the-basics-part-2
http://www.raywenderlich.com/12816/icloud-and-uidocument-beyond-the-basics-part-3
http://www.raywenderlich.com/12837/icloud-and-uidocument-beyond-the-basics-part-4
#MakeABetterGame! "Never give up, Never NEVER give up!" - Winston Churchill