Dualshock 4 is now officially supported on the Steam PC platform. Bit-Tech reports that while the controller had some form of support in previous builds, the current build integrates the gyroscope as well as the touchpad and make them viable within the game. That's a huge plus for using a Dualshock 4 now with your PC games!
Personally, I think it'll be nice to have some pseudo mouse ability as some PC games just feel clunky when you're trying to navigate menus utilizing a controller! I'll be testing out the functionality later today on Facebook with Star Wars: The Force Unleashed so I'll report back on how it plays!