beat me to the punch on the extreme amount of mouse movement. From a high level the interface looks kinda nice actually (though it's not something I'd use -- dedicated xmonad user here). Simple, clean and context sensitive, I guess. But holy crap as soon as I tried the mock-up I was immediately annoyed at how far I had to move the mouse!
Granted, for tablet use it probably helps prevent fat-fingering, and makes some sense, but I don't see myself spending most of my time at a tablet for the foreseeable future.