OpenGL ES 2.0, better Retina display compatibility, integration of the Chipmunk and Box 2D physics engines and a whole load of other features. What's not to like about this major new release of the most popular iOS 2D game framework?
Facebook also released a major new version of their iOS SDK this week with this update to v3.0. The most significant piece of this release in my opinion is support for iOS 6 integration when it becomes available.
These were actually released last week but I only noticed them when Ole Begemann wrote about them this week. Apple have released WWDC videos from 2004 through to 2008 alongside the more recent years. Have a quick browse and take a short journey back through recent Apple history.