Yesterday morning, Valve revealed the first steps of its plan to marry the new SteamOS to custom hardware. According to the Steam Machines Beta Test Agreement, Valve has developed a game controller. Speculation has been abundant about the third of Valve’s announcements, which is scheduled for reveal on Friday at 1 PM Eastern. “Valve Corporation (“Valve”, “We”, “Us” or “Our”) has developed and produced prototypes of entertainment system hardware and software, including a set-top box running custom software and a game controller (collectively: “Beta Products”),” the agreement states. Whether Valve intends to release this controller to market or has simply created it for the purposes of testing is unclear. Our Take ...