There probably won’t be a major difference throughout the whole side of the car, the differences will probably be focused in the Front clip, and the rear part (including tail-lights, decklid, and rear bumper itself). Diffusers will be similar to what we have now too, but probably gloss black if...
GT rendering sent in from Zander13’s on YouTube. Includes the BMW style wheels that have been spotted across several test-mules. Safe to say the production model took cues from the Audi and BMW if it does indeed include that front end.
I’m surprised no one’s posted this yet, anyways I think this gives us a better idea regarding the GT front end. However the rear will be slightly different than shown here.
Just a couple of “lines” that caught my attention, I believe this is an Ecoboost we are looking at, which in that case, I think it will share similarities with the Base Mach E. The GT will also probably share the lower vents that the coinciding Mach E variant has.