It may be strange that Gran Turismo 6 is going tobe PS3 only, but it looks like a PS4 version may be in the cards, it will just turn into Gran Turismo 7. According to Po;yphony Digital CEO Kazunori Yamauchi, the studio does have a PS4 version of the game in mind, but it will take some time to come to fruition.
So much time in fact that it would probably be called Gran Turismo 7 by then. He also stated that he doesn’t know if the “vision” of Gran Turismo 6 would carry over to this hypothetical Gran Turismo 7. I don’t know what that means, but lhe could be cagy on purpose as the company figures out what they are going to do with the PlayStation 4 version of the game. It’s all hypothetical at the moment.
Gran Turismo 6 will launch on December 6th for PS3. PS4 version, well, we will see.
(Source)