Well it seems we might see iOS 5 coming in a matter of weeks and the GM maybe even next week. It seems that Apple has told developers to get ready for backup and restore for iCloud.
iCloud introduces a smarter way for users to back up their info. It’s important to read the new iCloud Data Storage Guidelines to ensure that your app works best with iCloud Backup and Restore, available on iOS 5.
The statement above was posted on the developer portal for new news. So this seems like Apple is giving developers information that iCloud and iOS 5 is very very close to being done and that Developers should make sure that their apps work the best they can with iOS 5 and iCloud.