GT5 would've been out by now if it hadn't been for the updates on GT5:P

[Xoj]

they also have more than double the amount of cars than forza
and 1080p in resolution 60fps twice the amount of cars in game.
they were also working in GT PSP. (800 cars)- more than GT4.

just one studio, head by a perfecionist. GT 5 delays are always a given.