Interesting but just kinda backs up what I've been saying all along about Kinect, it needs some sort of controller, they can have that you are the controller mess, you just need a controller for some buttons and tactile feedback, sorry it's not fun playing an FPS and not having a trigger to pull or a racing game with no wheel, this hack though I'd really like to see something like that from MS, if they want to branch the groups (your different gaming demographics) games this is what they have to do. 

What? You can't use Kinect standalone to play Call of Duty? Damn, there goes my dream of an invisible gun.

I think it is pretty safe to say it needs something like a Wiimote to shoot, and therefore there won't be a FPS tottaly with Kinect unless they make one.