So far we have no idea if it is or not. However, I'd say there's a good chance we'll at least see the V8 or GT500 when they are released to be put in the game around the same time.
I really hope they do. It's a good looking car. Kinda reminds me of the 4th Gen Mustangs (which were my favorite). Never Really cared for the 5th Gen except for a couple variations.