Though it’s still not clear what hardware Valve has in development , Xi3 Corporation’s modular computer might be a hint.

Xi3 announced a "development stage system optimized for computer gameplay on large high-definition television monitors” will be on display at CES 2013 at Valve’s booth. Xi3 also announced that Valve had invested in them, though did not disclose a specific dollar amount. In a press release , Xi3 CEO Jason A. Sullivan said, "This new development stage product will allow users to take full-advantage of their large high-definition TV displays for an amazing computer game experience. As a result, this new system could provide access to thousands of gaming titles through an integrated system that exceeds the capabilities of leading game consoles, but can fit in the palm of your hand."Valve also provided a comment on what it's showing at CES."Valve will be at CES to meet with hardware and content developers in our booth space. We are bringing multiple custom HW prototypes as well as some off-the-shelf PC’s to our CES meetings, which are low-cost, high performance designs for the living room that are great candidates for Steam and Big Picture.""We will be sharing more information to the press and public in the coming months."Xi3’s product is designed for Steam and Steam’s Big Picture mode according to the press release. You can find an overview of Xi3’s modular computers below.Nvidia also recently announced a small gaming machine and specified it was capable of playing PC games, though in a different capacity