Why would Forza Motorsport support Kinect?
Unless they were to market wireless attachments that come along with the game which is ludicrous.
The point of Kinect is to NOT use a controller or buttons.
If Microsoft has the balls to market attachments required to play the games on Kinect, the whole project will be a failure.

I think it will do well the potential for the technology when they first previewed it looked great e.g face recognition, colour recognition, tone of voice recognition, but now all they seem to be doing is movement recognition and then making wii copycat games like kinect sports and kinect fitness.