M Convertibles have always been lucrative for BMW. So the M4 Cabrio is a dead cert for introduction. Although limited in production , the E30 M3 Convertible sired an E36 M3 Convertible Which back in 1994 I had an E36 M3 Convertible in Green with a Tan leather interior for a few months. And of course further progress brought Cabrios of the E46 and E93.
The M4 will mirror the M6 what with Coupe , Cabrio and the imminent Gran Coupe. The current M3 Cabrio is a highly popular car and why not? Not only is it the best looking and best resolved Cabrio , the car has excellent standards of rigidty and handling even more so than direct competitors.
Its drop-dead looks can be contributed to the genius of Chris Bangle who set the challenge for the engineers to come up with a concept that mirrored the sleek proportions drawn up by the winning designer.
The folding hard-top continues as it has increased the car's popularity in emerging markets. A return to a soft-top was considered but was vetoed when the Cabrio hard-top contributed to strong sales in BRIC markets.