The iPhone Dev-Team has posted following the release of iOS 6 to detail which devices can be downgraded from iOS 6.x to iOS 5.x and which devices can be re-restored.
The Facebook app has been updated with a banner that lets you tap to quickly see more stories, swipe down to close photos, instant access to notifications, and support for the iPhone 5 on iOS 6.
Rather than using a CPU core based on a vanilla A9 or A15 design from ARM, Apple is reportedly using a custom core for the new A6 SoC found in the iPhone 5.