The new Sony Dualshock 4's have started showing up for individual sale on Amazon. Though no major changes that warrant tossing your existing Dualshock 4's, they are worth a look for future purchases.
The specs don't contain any differences and the controller will behave just the same when connected to a PC as existing controllers. Sadly, my and many others primary complaint with the DS4, the battery, was not addressed. They do benefit from better build quality on the internal workings of the sticks and triggers though so it is worth a look if you are planning to make a purchase. The light bar has also been modified to include a forward facing sliver which can be helpful in getting a quick glance at battery life, but may become a nuisance for nighttime gamers.
Sony Playstation 4 controller.
ODIF is a framework written for InputMapper 2 that standardizes controller input channels and types to make them universaly mappible to eachother.
An input protocol developed by microsoft in the mid 90's designed to attempt to standardise communication between input devices and games. Direct input has been mostly replaced by XInput for most gaming devices, but Direct input remains fully supported by Microsoft due to the fact that complex devices such as flight sticks and wheels require it due to the more complex and higher number of inputs.
The latest name of the controller mapping development project.