Sony Worldwide Studios president Shuhei Yoshida revealed that DualShock 4's basic functions will work on Windows PCs from day one.
Responding to a fan's question on Twitter, Yoshida confirmed that DualShock 4's analog sticks and buttons will work "just fine" on Window without requiring any special drivers.
@Napo2k the analog sticks and buttons will work just fine
— Shuhei Yoshida (@yosp) October 4, 2013
Interestingly, Microsoft previously announced that Xbox One controller won't work on Windows before its driver is released sometime in 2014.