Just one comment/criticism: Why in the hell have they rotated the volume control from the system tray?
It doesn't really add anything, and now I have two travel in two directions to adjust the level: Down, Left/Right finding the grab, versus Up/Down.
Mentally the vertical orientation is also simpler to grasp, versus left-or-right, scan-for-icon, see-the-plus, translate, ok-drag-right-to-turn-volume-up palava
Other than that, it looks pretty good, though I do hope apps linger in the tab for a while, so if it plays a short sound at full volume, I'd like to be able to change it after the fact, so it doesn't wake the neighbors next time.
PS. This kind of change on such a fundamental control should be forbidden unless a proper usability review is undertaken showing that the usability is improved.