http://www.youtube.com/watch?v=JTGSkYRDpWY
Courtesy of Penny Arcade. Interesting, how all the location ransmission is done by the remote, and the sensor bar is merely a point of reference. I guess that's a logical way to set it up, but still. I suppose then a wireless sensor bar is in fact possible, although I doubt we'll see one from Nintendo.
That makes me wonder whether a sufficient IR signal will be able to throw it off.
It also makes me wonder if the IR from the sensor bar is going to bounce around the room enough to affect my weird stereo, which has an annoying tendency to randomly respond to signals from any remote control in the vicinity.
I wonder about that myself. Although, it seems to be direct, and I can't think of too many IR devices that would be pointing AWAY from my TV.