The developer units have begun to yield various results
The Leap Motion USB motion sensor device has spawned another strange project that has to do with music.Back in December 2012, a certain invention called AirHarp came to our attention.
The contraption used a Leap Motion USB sensor to interpret waves and other gestures. Based on them, it played the virtual harp on the screen.
Something similar has made the news now: designer Stephane Bersot took one and made it change the pitch of his guitar, play air drums, even control the equalizer on a piano keyboard.
The pitch is changed according to the position of the headstock, the drum sticks (specially made) can be used to track end-points of the sticks, etc.
The video demo should make everything clear. No marketable product is expected to result from this idea though.