People are expecting a Nismo version but a Special edition for people who missed out on Proto Spec would probably do well and cost less for the buyer than a 60k Nismo
Some US people may be upset if there is no Nismo. Unless the Nismo is going to have a significant power boost and aero to match the upcoming GRMN Supra, with the M3 Engine they shouldn't bother. Talking 75hp boost at least, some weight loss and improved aero.
Any Nismo version will probably be heavier than the standard car.