[Silber]

So looking over this set of photos and some of the earlier ones posted of the non-M version of this car, there are some differences visible through the camo. If you look fender crease right over the headlights, that's a contour that either was really well covered up on the prior test mules, or it points to a different set of front fenders. I also don't believe that the standard 4 series has this crease and it's much closer to resembling the M3/M4. Similarly, the earlier models didn't have the rear fender extensions, and these are similar to what some of the early M3 test mules ran.

I'd guess either the entire GC lineup is wider than the other 4 series, or that this specific model shares some body work with the rumored M4 GC. That would be a massive win in my book.