It's not just about franchises, it's also about the first party studios. Naughty Dog, Guerilla Games, Santa Monica, Media Molecule, Sucker Punch, etc. All those studios can easily bring out huge games for the PS4. I definitely believe that Killzone 4 will be saved for the PS4 and Guerilla Games already confirmed that they are also working on a new IP. Naughty Dog is also most likely working on a new game since they have 2 teams and one is doing the Last of Us. Santa Monica already confirmed that Stig Asmussen is working on a new game. Sucker Punch has been quiet ever since the launch of inFamous 2 and they have already shown a picture of the team in a meeting possibly giving ideas on a new IP/inFamous 3. I mean the list goes on and on, Media Molecule is doing another game after tearaway. Sony will have a game that will please different type of gamers and that's what will sell the next gen PlayStation.