Valve continues to tweak the elusive Steam Controller, recently adding in an analog stick into the design alongside the existing setup that includes two touchpads, several trigger buttons and traditional faceplate buttons.
The original design of the Steam Controller had a touchscreen in the center, which game developers were set to harness through an API. A revision of the controller in early 2014 replaced the touchscreen with more buttons, including a d-pad, in a design that was closer to traditional console controllers.
It's possible that Valve wants to make the Steam Controller more accessible to first time users, explaining the addition of an analog stick alongside two touchpads. Early reports from people who have tried out the controller say the touchpads take several hours to get used to, and even longer to achieve the promised PC-like accuracy.
There's still no definite word on when the Steam Controller, or Steam Machines for that matter, will be available to the public. In May, Valve pushed back the project's launch to 2015, so there's still a chance Valve will once again alter the design of their gamepad.