Valve has officially announced a controller, called the Steam Controller, that is currently in development and will be released next year. The Steam Controller will be compatible with Steam machines as well as PCs. Prototypes of the controller will be available to beta testers later this year.
Steam Machines
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Valve announced earlier today that SteamOS hardware is currently in development. According to the announcement page, there will be “a variety of Steam gaming machines” available in 2014.