I was big into experimental interfaces in around 2006. There was a similar peripheral for the Mac whose name escapes me. (I only ever saw marketing material for it.)

It had a sensor to detect the depth and positions of your hands above your desk. Its software would then cast a hand-shaped shadow on your screen, so you could see what you were about to interact with. The UI was like a touchscreen, but you'd abstract the touching away from the displaying for ergonomics.

It was a cool concept. Bummed it never went anywhere. Sprout could be interesting, but it would be a lot more interesting if it came from a brand that moved platforms (like Apple). I don't know if HP has the developer mindshare (or sales volume) to have a "revolutionary" product that people get excited about. There are too many other Windows machines (both inside and outside HP) for this to get the attention it deserves.