I'm sorry to "rally" again, but it's pretty much confirmed to be a port...
"We actually do have a PlayStation 4 version in mind," said Yamauchi, "but for this holiday season, we thought it would be best for users to release on PS3 for now.”
Yamauchi added that, thanks to the new, flexible engine of Gran Turismo 6, the PS3 version could in fact become the PS4 version one day.
"I thought the best scenario would be to have the game come out, then to have new scenarios, new DLC and other updates.
"Once the players have thoroughly played out the system, if the PlayStation 4 version came out naturally, as part of that process, I think that would be the best scenario."
"There's a distinct possibility it would be called Gran Turismo 7 by then, Yamauchi said, adding that he doesn't know if the "vision" of Gran Turismo 6 would carry over to this hypothetical GT7".
These quotes are from last year, so when he says he doesn't know if the "vision" of GT6 will carry over to GT7, we can now conclude that he was hinting at/referring to the "yet to be announced at that time" Vision Gran Turismo (VGT) Project. Honestly, I believe GT6 is pretty much a dumbed down GT7 already that the PS3 just can't fully handle. Thus all the delays and bugs. I'm also starting to think it will soon arrive that the fully functioning course maker will be on GT7/PS4 and something less will be given to us for GT6.
But, yeah... Sorry... Umm... Back on track?