This looks pretty cool IMO. It could be a bridge between the gestures we have on our phones and the screens on out iMacs / Laptops

Leap Motion (http://leapmotion.com/)

I was looking at that earlier and the only problem with it is that you need to hold your hands over the device for it to work. I would prefer for it to work like Microsoft Kinect were it is like a camera. But Apple could certainly include something similar to their iMac designs.

I like the idea.