the biggest improvement of kinect/eyetoy seems to be lack of lag (though will ahve to see a proper demo to see if thats the actual case and not an ad) this is the reason why as I predicted kinect will only see party/dance etc games. Too much lag!
But just like kinect I see ppl are not thinking this through, eg claiming this will aid modelling etc.
No it wont, its inferior to what we have now. heres why. grab you mouse move the cursor 3 pixels to the right hold it for 5 secs and then move back 3 pixels to the left, possible yes but hard.
Now hold your finger up in the air and try it, impossible. Since youre not balanced on a nonmovable surface accuracy is greatly reduced.
though games could work well eg a FPS, you will need a one=handed controller though in one hand.