I though the hardware was just a simple motorized camera with infrared included for depth... I would think the tracking, face and voice recognition and all that kinect is is actually done by the software / firmware inside the 360 and if so, why can't you do the same tracking with the ps eye? is the tracking actually done by the camera??
the fight does head tracking with the ps3 eye, if your lighting isn't perfect though then you are SOL.
but that's actually also the case with kinect, it doesn't really work great in a badly lit room.. hmm.. come to think of it, I wonder how the eye icm with Move will work in a badly lit room (I have a projector as 'tv' and therefore my room is only lit by the projector, but since the ball itself is lit I guess it might even work better hihi)..