The 300 individuals selected for Valve's Steam Machines hardware beta program will receive one of Valve's fancy new controllers as well. Along with the controller announcement today, Valve specified how the beta program controller will differ from the final version.
The controller will not include the clickable touchscreen in the center, which will be replaced with four buttons. Additionally, the beta program controller will require a USB cable instead of being wireless. It's a small sacrifice the chosen 300 will have to make, but at least they'll have their hands on the first Valve-created Steam Boxes. We're still calling them that, right?