Getting a PlayStation 3 controller working in Windows requires downloading third-party drivers and tools, but thankfully it'll be far easier with the PS4's DualShock 4. The new controller's "basic functions" should be just peachy on PC, though don't get your hopes up about fancy things like its touchpad or light bar.
He clarified that it'll be Windows-compatible "for basic functions" by default. As for whether it'll be specifically recognised as a DualShock 4, he said to responded "wait for field report after the launch." Enigmatic!
Compatibility hassles gave the Xbox 360 controller free rein to become the de facto gamepad of PC gaming, and while this may not change that, it is at least good news for people who prefer the feel of Sony's buttonblocks.