Not going to lie, that controller is looking pretty ugly. Any word on if they'll support USB controllers? Obviously you'd lose the touch functionality...unless you plugged in a Wacom or something, lol
Well, the system is open and hackable, I'm sure someone will write drivers to allow PS3, Wiimotes, 360 and generic USB controllers to be used.
Xbox 360 controllers would require either wired or the RF adapter that MS sells for PC use.