I'm familiar with the usual "arm-waving sucks" arguments against gesture-based inputs, but I was just wondering -- is there any reason this couldn't just replace the touchpad on laptops, maybe being integrated into the forward edge for a larger field of view?

They do claim sub-mm accuracy; maybe applications in the small are realistic.

So instead of arm-waving, think of rotating your hand just above the touchpad to rotate and object in 3d space, but briefly. And the touchpad would still work like a regular touchpad, but maybe you don't even need to touch it.

Sub-mm accuracy seems to imply that really subtle gestures could work.