They have just announced a state of play with a gameplay demo for this Thursday, I wont be surprised if that would be shown with the 60FPS mode.Looks absolutely stunning. Hopefully they'll upload a 60fps version of the trailer soon!
There are some prerendered scenes. But the gameplay scenes look so good that they come close to the prerendered and it all looks nearly seamless.
I hope you'll change your avatar again for Ratchet.