I'm also interested in HTV Vive support. And regarding the Oculus Rift's old versions, I used to get sick in a few minutes tops and expected more of the same with HTC Vive. But when I tried it out I was very pleasantly surprised that I didn't get sick with it at all I can use it for hours. But probably big part of that is good movement design in the programs: never move the user WASD style - always teleport or use some other non-motion-sickness-inducing way for moving. For smaller movement in Vive user can physically move themselves around the room.