Ok, this is what I think we will see a lot of. No talking, no vision, no touching, just some simple gestures.

Dave Rosenthal (former MIT/Sun/nVidia not archivist guy) and I talked a bit about gesture control when the first MEMS accelerometers came out. They allowed for a wide range of controls but they drifted horribly so it wasn't possible to do a sort of "hold for fast forward" kind of motion. You had to have a move to start and a move to end.

To some extent this is the same problem as the Leap which can know where your fingers are but you can't hold a gesture and move your hand (afaict, I've not seen the LEAP SDK in action yet)