Ugh, not that thing. Close, but there are differences. I had a Leap motion, it broke after a year. But in any case, it never quite worked out that well, and suffered almost as badly from gorilla arm syndrome as a touch screen. I was disappointed with it. It's also difficult to perform small, sensitive movements with your hands in the air hovering over the sensor, despite the fact that LEAP has high definition scanning.
My first thought was this was too similar and just as futile, but on further reflection, maybe not.. if you can just rest your arm on the desktop surface like you would for using a mouse, and not have to aim your fingers anywhere specific this might be comfortable and useful enough to be the "mouse killer" HID developers have been hoping for.