The Rift is both input and output, though the input is fairly limited to head movements and generally requires supplementary input for gaming.
In any case, I don't think it is what Valve is hinting at, though it is something they have made some moves to support already in the form of TF2 and limited HL2 support.
In any case, I don't think it is what Valve is hinting at, though it is something they have made some moves to support already in the form of TF2 and limited HL2 support.