They look amazing! I think I like the new grille
M3 rear fenders are again wider than M4, looks more aggressive!
M Performance parts look good! But mostly the new exhaust layout and the CF wing. The wing looks more fitting than that of the last gen GTS. I see some major innovations. Exhaust tips are also round which they messed up in the new 4 series M Sport.
Kudos to BMW for trying something new and not playing it safe.