"Play on any SteamVR system. If you have VR hardware that works with a computer, then it works with SteamVR."
Bravo Valve. This is why anyone interested in this should get a Vive and stay well clear of Oculus/Facebook's headsets. They are busy trying to capture the VR market by setting up exclusivity arrangements with studios to lock games to their platform to cut others out which just divides up the already small market.
Value have built a cross platform framework and SDK and are releasing their games for all headsets.