At the end he mentions "[In 5 years time,] when you buy a computer, you'll get this." I think that's about 5 years too soon on that one. Incredible demonstrations though... awesome to see science fiction become reality.
All you need is a large display and a webcam. Isn't Microsoft already doing this for gaming? The enhanced resolution Wii controller with a large flatscreen already has most of this capability.
Should be interesting for gaming, but just as in general computing application this type of control mechanism isn't suited as a complete replacement for a mouse or a joystick.