Last year there were some rumours about GT6 being available on Vita:

http://www.digitaltrends.com/gaming/gran-turismo-6-coming-to-playstation-vita-as-well-as-playstation-3/

IGN community member Adam Latham received a customer survey from Sony inquiring about both the Gran Turismo series and the PlayStation Plus subscription service. The questions strongly hint that, like Sly Cooper: Thieves in Time and PlayStation All-Stars Battle Royale, Sony may release the next Gran Turismo on PlayStation 3 and Vita simultaneously.

Since porting from PS3 doesn't seem very hard, I hope this comes true. I'd buy it in a heartbeat.

I don't know how they'd fit it in a tiny 4gb card though.

Would you be interested? Do you think it'll happen?

Another half-assed GT? nah. Gran Turismo is not the kind of game that will sell more Vitas, unless you tie it to a console version in a very, very meaningful way.

In some form yes, but a full-fledged GT6? I don't think so.  Maybe a prologue style game. It would fit the vita better, jump in and race. No worrying about tuning and the sim stuff that comes along with it. If they finally add livery it would make a good painting pad, I’d also like to see them use  the vita as a speed and tachometer. Which I would guarantee it would help push the vita all over. Sim guys would freak over it, Hell I have a 500 dollar wheel and peddle set just for this game, I’d buy a second vita just for this so I’d never have to take it down. 

It's better than not having a GT game there..

I'm thinking PS3/PS4/PSV simultaneous release, with obviously the PS4 version looking the best out of them all. PS4-PSV versions will be able to migrate saves and race data.

No.

GT6 is for PS3 only.

Plus GT Vita for Vita and GT7: Prologue for PS4.

I doubt it. I think GT6 is going to be used as a big money maker to allow the PS4 launch price to be a bit lower and maybe bring forth the Vita pricecut (outside of Japan) a bit.

It could save the Vita in Europe. I don't think it will happen though.

no

ridge racer!!!!