Aren't GT3 models for racing only? Maybe they'll outfit a AMG GT for race use, but I don't think they'll release one for he average buyer. Going to be hard to make something like that street legal.
Odds are once some certain things are looked at it and changed it can be legal. Odds are someone is already planning how to make that possible. Same thing happened with other vehicles. The McLaren P1 GT-R is one prime example.