Valve has registered a new trademark for a project called Chaperone." The description indicates this has to do with their VR/AR plans, saying: "Hardware and software, sensors, and beacons for the detection and measurement of physical objects and the representation of such objects in virtual reality environments; Devices used for the detection and measurement of physical objects and the representation of such objects in virtual reality environments; Electronic apparatus for the detection and measurement of physical objects and the representation of such objects in virtual reality environments." Thanks reddit via Eurogamer.