The very first game announced for PS4 is called Knack.
What we've seen is that it looks very much like a Dreamworks game. The characters seem to come to life on the screen. It's very impressive stuff.
The game uses the Unreal Engine 4 and stars a little robot orc-looking thing that can turn into a giant.
We'll update as we find out more, but in the meantime here is a screenshot.