facial expressions translated to video games

Although there have been some neat webcam plugins for logitech, nothing on this level of tracking.  Basically with a kinect camera, it would seem that with the right software it can track your facial expressions in real-time.
http://gizmodo.com/5960875/how-your-video-game-character-could-soon-share-your-rage-face

It even talks about how this could one day be used for world of warcraft or second life.  I can only imagine how cool it would be if your second life avatar could mimic your facial expressions, especially having one of the opposite gender.  I find it especially interesting that in his demo, he does briefly use a female avatar