Finally saw it in person, M4 Competition Frozen Portimao Blue with black interior and carbon bucket seats. I have to say that it's not "mainstream" like the previous models - you like it or you hate it, no half measures. I'm in the first camp.
I already liked it in pictures but live is amazing. The front end is aggressive and unique.
Unfortunately, I wasn't allowed to take photos. But the guy did turn on the engine, and I can confirm that the sound is pretty decent. Definitely louder than my M2 Competition but of course not as loud as the F82 M4 Competition. Less raspy also.
The carbon seats are beautiful, but could be a bad option if you are over size. They don't permit any movement and it's not very easy to get off the car. They are more beautiful than practical.