Forza 4 with XBox Kinect lets do you virtual walk arounds

Wow! I just saw this Youtube video of Forza 4 with the XBox Kinect that allows you to move your body and your arms to do walk arounds of cars, get out of cars, get back into it. Pretty amazing. It looks pretty smooth here in the demo, but I wonder how accurate it will be in production, especially when you have people behind you or people around you that might be moving, and have the XBox Kinect pick up other people's motions.

I found another video that gives more information and looks to be from E3

It looks like the Kinect has some kind of head tracking feature to determine where you're looking, and base your vision or direction on that. It also has voice recognition features to help you navigate the menu. We're happy Microsoft has kept the Kinect as an accessory as opposed to a gaming platform. Keep at it Microsoft!