New renders of the M2 Cabrio.
Such a concept remains a possibility, especially with the M2 becoming a series production car.
The rear lights are similar but in the actual car they wrap around in the opposite direction as proved by a recent bodyshell spy photograph.
Aerodynamics are still too dramatic.
Recent 2 Series Convertible spy photos:
More at http://www.2addicts.com/forums/showthread.php?t=775774