In saying that, odds are there will be two versions. There seems to be a lot of that out of Japan. A JDM version and American version. Case in point was the 200sx. A lot of the sources that I have that go to Japan every month have also said the same thing.
Either way the GTR will be a limited produced car. Limited to what, who is to say. They may produce as an example of 5,000 units for the JDM market while the American market may only see 2,000 units. Who knows. The first two years will either make or break the car's viability.