Try as they may, BMW can't manage to conceal every last bit of the 1M Coupe. Our members have now spotted the 1M mirrors, carbon fiber diffuser/rear valence, and possibly an aggressive hood design. Scott26 also
confirms a carbon fiber roof.
Mirrors, posted by Scott:
Carbon fiber rear diffuser/valence, posted by M3roar:
Possible aggressive hood vents/lines?, posted by niuniu
And there's also the previously discussed front fender vent / cutout.