If this thing is as good as their video shows, I definitely want one. It's even better than a touch screen because you can work in all three dimensions.
Imagine reaching in and manipulating on-screen objects without requiring a data glove. It seems far more accurate than any visual sensor that I've seen before, and it's not overpriced!
This would be great for 3D modelling, and while at first there probably won't be many games and apps that take full advantage of the unit, they'll come in time. It can already replace a tablet's touch screen, so that's a good head start.
The lack of fingerprints on the screen is another plus, but the downside is that our arms are going to get tired pretty fast. I seems to be an addition to (not a replacement for) a keyboard, mouse, and gamepad, and I'm looking forward to seeing more.