Do this with a game with non-shitty graphics using a modern engine that pushes a 680 to its limits and THEN I will be impressed. Until then its just a publicity stunt. Step in the right direction...yes. But a big old 'meh' none the less.
Now HOPEFULLY we one day get to the point where an OPEN std is THE STANDARD and not owned by any company but this is just Valve wasting resources on
PR.