"In SteamOS, we have achieved significant performance increases in graphics processing, and we’re now targeting audio performance and reductions in input latency at the operating system level." I'm really interested to see the trickle down effect that this will have on other Linux flavors. Having a push for standardization from a big name company like Valve should provide a better Linux experience for everyone.
What performance increases in graphics processing are they talking about? I'm with you thought, I do hope all of their work will be landed in mainline kernel so everyone could enjoy the benefits, and we could play games (through Steam or other methods) on most Linux distros, without much hassle.
http://www.phoronix.com/vr.php?view=17823
That one is about how valve themselves got value out of debugging on open source GPU drivers.