iOS 7 Updates:

Some really useful iOS 7 design and transition documentation together in one place for easy access and redistribution.  These docs are very much in flux with the rest of the new OS, but they should give you a good sense of the new design patterns in iOS 7, and may provide some good tips for creating an app which successfully bridges iOS 6 to iOS 7 while we need to support both.

https://developer.apple.com/library/prerelease/ios/design/index.html