Gran Tourismo PS4 could be 7 instead of 6 according to the development time that it is going to take. The news was revealed recently at Gamescom with a statement from studio saying it has PS4 version of GT in development that could take some time.
GT 6 for PS3 is set for release on Dec 6, the news was confirmed in Gamescom, recently and is set to feature concept cars designed exclusive to the game from companies like Aston Martin, BMW, Honda, and Nissan and other 18 partners that are working along with Polyphony Digital. A movie based on the game is also on the blocks the last piece of news related to GT from Yamauchi at Gamescom.