Perhaps the most novel non-gaming function of the tablet-esque controller is its IR-based universal remote control ability -- the GamePad can be used to control your HDTV (well, "most" HDTVs) in some basic, but very important, ways.
Two-dimensional tracking would be managed via the existing Move's visual spectrum camera, or by using a display-mounted IR emitter in conjunction with a remote mounted sensor (again, just like the Wii controller).