Since the Wii is being used just for the sensor bar its really not needed. For those who don't know the "sensor" bar doesn't sense, it transmits IR, which can easily be duplicated by oh I don't know lamps or candles.
Pretty slick how all of that is put together, but I am still not sure that I would use it. You still need the keyboard for too many things, plus keys are still faster than trying to point and aim the controller, as well as clicking up and down the hotkey bars. BUT, I think it's incredibly creative that someone put it all together to get it work. Could make a whole bunch of other pc games more interesting.