The HP Reverb G2's motion controllers have also been redesigned

[Windows Central]

Best answer: The HP Reverb G2 VR head-mounted display (HMD) includes two redesigned Windows Mixed Reality motion controllers. Despite being designed with help from Valve, the Reverb G2 will not work with Valve's "Knuckles" motion controllers without some significant work.

Full story from the WindowsCentral blog...