Valve is going to launch it's own Linux based operating system designed for the TV and living room for PC Gamers.
It’s still unclear exactly what SteamOS will run on though. Valve says the traditional Steam client and SteamOS will support in-home steaming, giving players the ability to play all of their existing Windows and Mac games on a SteamOS “machine” hooked up to their TV. It sounds pretty similar to the Remote Play functionality offered by the PS3/4 and PS Vita/PS Vita TV.
The OS will be available for free here!