GT6 is official and coming to the PS3 this year, with 1200 cars and seven new tracks including Silverstone. You'll be able to try it out in July when a demo is released.
It'll has an all-new physics model developed in tandem with automotive manufacturers and an advanced graphics engine that introduces adaptive tesselation.
GT6 will also add new tracks each month.
Looking to the future they say that they have a PS4 version "in mind"