"We are excited by the prospect of bringing the ultimate Metro experience, powered by next-gen PC hardware into the living room," 4A Games CTO Oles Shishkovstov said in a statement. "Metro: Last Light will be a great showcase for Steam OS and the Steam Controller."
Yesterday, Valve showed off the images of its own Steam Machine prototype. Announcements from multiple partners for their own Steam Machines are expected at the Consumer Electronics Show in January, with the hardware going on sale starting in mid-2014.