^^only time will tell, my Martian avatar friend.
Personally I think will have good sales and at least move as much hardware as MGS4 did.
But I do believe that the longer it takes PD to release the game, the more it will hurt them.
By the time it releases, all the cars they so lovingly added will probably be just short of being classified as antiques, and who's going to want to buy GT: Model-T racing?

Proud Sony Rear Admiral







