Interesting demo. It uses a projector combined with kinect to turn your living room into part of the gaming experience. https://www.youtube.com/watch?v=sJ4hWa6y710
For the tinker: Look for blender (as motion capture software) in combination with video system or even the kinect. At least you don't need to sell your car ;-)
I really don't trust Microsoft on new peripherals after the Kinect, obviously they can market anything, but the question is can they make it a better gaming experience