Forza 4 definitely does look very nice from the demos I've seen, and it is released in only a couple of weeks. I don't own a 360, but the Forza series is one of the things that would persuade me to buy one. For the moment GT5 and other racing games on PC and PS3 are enough.

I also agree about wireless wheels. I hated them on the Wii as it just doesn't feel right trying to steer a car in a game by holding something in the air; it just feels wrong. Steering wheels need to be fixed to something, and as you say your arms get heavy very quickly.

Interesting idea about using kinect to change in game views, but it sounds like a gimmick to me and I imagine most people would only try it once to see it working then forget it and get on with racing.