It’s still not confirmed by Sony, but Gran Turismo 6 has appeared again online, this time on the LinkedIn page of a marketer at SCEA.
The mention, now removed, read (emphasis ours):
Managing the following titles and franchises at Sony Computer Entertainment America as product manager, handling strategic planning, day-to-day marketing activities, and lifecycle management:
Gran Turismo 6 and GT franchise, The Last Guardian, MotorStorm, Journey, Carnival Island, other titles yet to be announced.
Strange that GT6 is not included in that ‘yet to be announced’ category, yes, but it doesn’t appear to be a typo; GT5, GT5 Prologue and GT PSP are all listed later in the profile in the past tense.
Back in March, members of the development team were spotted taking photos and measurements at the Mount Panorama course at Bathurst.
A Vita entry in the franchise has been rumoured of late (and may be on the way, given the “…and GT franchise” snippet in the profile), but it sounds like a numbered, and therefore likely home console, edition is closer to launch.