"iOS 7 is a major update with compelling features for developers to incorporate into their apps. The UI has been completely redesigned. In addition, iOS 7 introduces a new animation system for creating 2D and 2.5D games. Multitasking enhancements, peer-to-peer connectivity, and many other important features make iOS 7 the most significant release since the first iPhone SDK. "

From the iOS Dev Library Pre-Release

Also added UIKit Dynamics for physics.