Insomniac Games is teasing something on the Playstation Facebook page. There's an image of a warp-gate looking thing with the words "When Worlds Collide - Heroes Return". Given the "worlds collide" bit and the fact that the image looks similar to a jump gate from Jak & Daxter, people are speculating
that this might be a Ratchet & Clank and Jak & Daxter crossover game. However, the J&D jump gate image is rather generic and Insomniac devs have been spotted playing something called "Ratchet & Clank : Into The Nexus", so it's probably just another Ratchet & Clank game (with possible cameos from other Sony franchises). IGN is supposed to have the reveal in the next few days.