Epic doesn’t have to do anything with it, ControlVR is creating the integration themselves, there’s nothing that needs involvement with Epic. For instance SixSense is doing their STEM controllers which will support UE4 and SixSense is going to be adding that support all themselves. The only reason that the Oculus Rift is something that Epic is working with is because the way it’s doing things is going to be the standard for VR headsets so it will be able to support more devices.