Won’t really know for a while yet. We all have to chill out until the car is revealed. Will the front and rear bumpers be completely new a la the renderings. Will the AWD system mean different suspension than the FWD counterpart? Too many questions at this point to say. Just try to be patient. We have a long way to go.
Suspension will probably be different, and if not, the spring rates will definitely be different. Spoiler is probably only body part that will swap over as front and rear bumper design will probably be different, but why would you want to? I suspect the GRC spoiler to be more aggressive and more purpose built for downforce.
I assume it will be a 5x114, but I'm always worried about companies and their cost cutting measures. Like they could fit a parts bin 5x100 hub on there and drop the bigger brakes to "save the customer money."