Tomorrow we´ll see Gran Turismo 6 in some kind of trailer. Not game-play.
If they finally announce the PS4 as everyone expect, they need to give people very good reasons to buy it at release...if they release the PS4 with some of its great exclusives, it will be better.
They need to do this, people also want this. Imagine Killzone 4, Gran Turismo 6, GoW 4 and LBP 3. Let alone the other important...well to me every exclusive is important.
I am sure that it will be, if not a release, it will be one of the first PS4 games in the first quarter at last. (end 2013 and first quarter 2014)
Th best seller game...a "premature" release also will make a place to the upcoming title in the same generation as all other titles came. And also the advancement in the graphical aspect of it could be even more noticeable from 6 to 7. And add a gap in where PD could make a Tourist Trophy II game in the middle of both games.
To me that would be the best and smart choice. I did some marketing and sometimes I don´t understand why this kind of stuff never happens. The costumers are waiting always and you need to deliver. PS4 has to deliver.