According to an IGN reader, a survey created by Sony points toward the existence of a Vita installment for Gran Turismo. Adam Latham received said survey which read, “You told us earlier how interested you would be in buying the PS Vita version of the latest Gran Turismo game,” the survey reads. “Knowing that you might be able to get a discount on the PS3 version of the game, how interested are you now in the PS Vita version?”
Another section of the survey inquired about future PlayStation Plus offers, “Imagine that as part of PlayStation Plus, every time you bought a game on either PS3 or PS Vita, you would be entitled to get the game on the other console absolutely free. So, if you bought Resistance on PS Vita, you could download Resistance on PS3 for free. Or if you got FIFA on PS3, you could download the PS Vita version for free.”
A final question then asked about interest in buying various PS3 games in different formats.
While this is far from confirmed, these seem like ideas that are perfectly plausible for Sony.
Images and original story can be found at IGN here.