I thought all this had been laid to rest a long time ago. The Kinect Forza tech demo was precisely that - a Kinect tech demo. It wasn't Forza 4, and it wasn't supposed to show Kinect as the recommended means of control for future Forza games, it was merely a demonstration of something 'cool' that could be done with Kinect - it was there to show what Kinect can do*, not what Forza might do.
*Personally I think it instead highlighted one of the things Kinect can't do - be a precision controller for action games - but that's Microsoft's problem, not mine.
Oh, spare us, please. There's a lot to criticise about the way T10 treats their customers, but they do at least have some avenues of communication. PD produce good games, but there's nothing to show that they have any interest in their customers whatsoever.