Perhaps I misunderstood your question, but Project CARS
ditched the PS3 a long time ago. That being said, we do plan to have a SNAIL [Project CARS] Series when the game eventually launches. It'll be SNAIL's first series on the PS4, but certainly not our last. When GT7 launches, SNAIL will make the jump to the PS4 along with the Gran Turismo franchise itself (which is already one of the only major gaming franchises, racing or otherwise, that hasn't launched on a next gen platform yet).
However if, after we jump to the PS4 for GT7, we realize that Project CARS is the better option for SNAIL, then I guess it's at least conceivable that we could jump to Project CARS as a whole. But
as I've stated before, I'm rooting for GT7 to blow the socks off of Project CARS. 👍