It is super cool technology that works much, much better than anything else I've ever seen. Question is what will be the killer app? Will it come from Leap or (more likely) a clever programmer hacking on the SDK? And will the financial rewards flow to Leap?
I'm picturing a game like Rocksmith that doesn't require a real guitar anymore because Leap can be used to track finger positioning over every fake fret and string. (Although I would still consider this a step backwards from Rocksmith)