Whoopsy:

Likely GT3RS components, the carbon fenders and magnesium hood, different front bumper with a bigger opening for cooling, and with a different rear bumper for the different exhaust configuration.

Likely will have similar wing from the GT3RS too, maybe higher? 

Tires sizes should be the same as the GT3RS, the fenders really can't be stuffed any tighter.

All these are what we had been suspecting all along.....................

 

wing with aero inlets maybe?