In the video above we get a brief glimpse at the camera that Pebbles Interfaces are using to track the hands, which would appear to be the “custom optics” mentioned in the post. The camera appears to be something that developed at least in part by Pebbles themselves, and if their YouTube video from 2012 is to be believed was the first ever depth gesture camera created. According to an archived version of Pebbles’ website, “[they] develop advanced motion sensors that display physical objects within the digital space, at any range or angle, with no latency.” Notice in that that statement didn’t say hands but rather objects, this is very important when considering the broader strategy.

Source: What Oculus’ acquisition of Pebbles Interfaces means for the future – Virtual Reality & Oculus News and Events [Image Credits: http://uploadvr.com]