It seems that in addition to x86 architecture, the PlayStation 4 has even more in common with the PC. According to a Redditor who attended PAX, the DualShock 4 will work as a native C gamepad when connected via its USB cable.
The details are vague, but this comes from a Galak-Z dev who confirmed the information on the show floor. In addition, quite a few PS4 demos at E3 and Gamescom were allegedly running on PC hardware with a DualShock 4 connected. It’s unknown if the controller with perform as a DirectInput device or an Xinput device, nor do we know if Bluetooth input will be supported.