Jeff Bellinghausen, former Chief Technology Officer at Sixense, currently works for Valve with their hardware initiative. He will be provide the voice over for today's controller walkthrough video. Four very different games are shown with very input configurations.
As a little background, Sixense partnered with Valve and Razer to develop the Hydra motion controller. I had a strong feeling that this technology would form the basis of the Steam hardware experience when first rumors of "The Steam Box" circulated. Clearly, either I was wrong or Valve dumped the prototype for their current (slightly more standard) gamepad.
Yet at least one of the engineering minds behind it kept with Steam OS.
The first and third games shown are Portal 2 and CounterStrike: Global Offensive, respectively. Portal 2 is operating in keyboard and mouse "legacy mode" where sliding your right thumb emulates the movement of a mouse and the left thumb activates a virtual D-Pad. This input method seems to have some sort of throw velocity when you quickly swipe your thumb across the pad and release although I obviously have not directly experienced it.
On the other hand, CounterStrike does not require auto aim.
Civilization V has the left thumb pad bound to map scroll and the right thumb pad controlling mouse movement. While precise, I could see speed being a problem for a game such as Starcraft 2. It seems to be slightly slower than a mouse. I would like to see someone learn the controller and attempt to ladder for a relevant amount of time.
Speaking of speed to complement precision: Papers, Please blends both thumbs into a single mouse movement. This highlights what, at least I guess, is the entire point of the new controller: allow new schemes to be tested.
Certainly, there are a bunch of possibilities even before the design leaves Valve's hands.