Lots announced. My personal take:
* Folders. Finally!
* Multitasking. A little bit of a fudge by the looks of it, but highly welcome. Probably as good as it was going to get.
* Background audio. Cool!
* Bluetooth keyboard. Ooooh. Potentially thus Bluetooth gamepad?
Definitely did not see explicit reference to shared files between apps though. Why? What is so bad about having sound files that can be used by a bunch of different apps?