Least this way, only microsoft fanboys will miss out on motion sensing. Unless it ends up like the gametrak or eyetoy. Can't help but wonder what the Sony fanboys who complained about the wiimote will say. Undoubtedly it will be different to the wiimote, or they would have never complained about it or some other rubbish excuse.
Still, least it justifies the price a bit more for people who aren't sure whether to get one or not.