Interesting:

At Steam Dev Days today, Jeff Bellinghausen with Valve Software said the company is slated to release an update that will expand Steam Controller configurability options to the PlayStation 4's DualShock 4 controller.

That means more options for players, allowing them to tailor the functions of the PS4’s touchpad and gyro features – options that aren’t available today when using the DualShock 4 with Steam.

Co-presenter Lars Doucet, developer of Defender’s Quest, explained, “Believe it or not, when you use the PS4 Controller through the Steam API, it’s exactly the same as a Steam Controller. You make the exact same API calls, you only get actions, not inputs, and the Steam API takes care of everything.”

He said that Valve is supporting the PS4 controller first due to its overlapping functionality with the Steam Controller, thanks to the gyro and the touchpad. However, support for other controllers is planned.

http://www.gamasutra.com/view/news/283223/Steam_to_expand_PlayStation_4_gamepad_support_in_new_update.php

So what does this do, exactly? I thought the controller came with its own PC drivers, and you could configure its use on each PC game directly already.

Added info.

Awesome. Dualshock 4 sales will increase for sure. Good move for valve and Sony.

That's...really cool, actually.

Oh, they added gyro and touchpad support? That's pretty cool, but I'm wondering which PC games are going to use those functions.

Thats pretty... Random. But awesome!

What Sony should do is release PSNow on Steam so that more people will know that it is available and its better to have everything in one place. It will also let people know what games I am playing and etc

This here is very good news since I'll be looking more into Steam in the next few months.

That is HUGE news.
Sony will sell more of these, and people on pc will be able to use decent controllers now.

Glad to hear it. Got myself an Xbox One Controller. The new one with Bluetooth, because I don't want to have a dongle blocking a USB port. Turns out that thing is shit. Don't get me wrong, the controller itself is okay. But every now and then, it loses the connection and then all hell breaks loose! My whole system is freezing, I can't do anything until I turn off the Xbox Controller, turn it back on and wait for it to connect. It really gets on my nerves. Works fine with cable, but I didn't spend 60 € to play with cable! Fix dat shit, Microsoft! xP