To the OP and first post...
Pardon my ignorance but why would it be a blast to drive? If you have the Mini cooper S '11. You have this car.. What would make it more fun than the regular one? The stickers? This is the problem with GT..
I remember seeing a trailer for GT5 and it appeared to have Nascar's "Car of Tomorrow" in there and they are quite different from the Nascar's in the final version. I know I saw it on here but I forget where.
GT:HD The Subaru Impreza Rally Car from GT:HD is not in GT5 (despite being new model)
GT4
Also ALL of the special Black cars are missing from GT5.
It's just in standard form, we still have it.
What about the 787B? Regardless of a slightly different livery, it doesn't count?
There's another car in the game that was not released but, it was in GT5P. The Tuned Z06. Look at the photo for the Nurburgring 4hr. You will see the white Corvette at front LHS of the pic.