From my understanding, isn't the Steam OS just another variant of linux? Now think at the moment of any major publishers that are on that bandwagon. One would most likely see a port to the Apple OS(no damn idea what its called) before seeing a linux version. Not even Blizzard has felt the need to make a version that would work with linux natively. Now that the situation at present, but who knows a few years down the line. Everything right now is just a wait and see situation.