[nrp]

I suspect infrared time-of-flight. http://en.wikipedia.org/wiki/Time-of-flight_camera

You can get pretty impressive accuracy and precision at short distances, and the plane of depth points matches what their demo video shows: http://www.youtube.com/watch?v=_d6KuiuteIA&feature=playe...

[jasonwatkinspdx]

I've read some other comments claiming that they can cover football stadium sized venues. If that's true, I think that suggests laser illumination.