It's Linux. They've already said as much. About 250 games available today, which is 10x more than XBone or PS4 (and 10x less than Steam on Windows).
Remember, Windows PC on same network = can play Windows games on SteamOS via streaming
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is it me, or does this pic:
http://hexus.net/media/uploaded/2013...361f96069c.jpg
look like everyone expected the next gen consoles to look like when the PS2, Xbox and Gamecube were mainstream