This render is a pure piece of art no doubt
However , the wing mirrors are taken directly from the M5/M6 which I doubt would be the case.
M3/M4 will definitely get its own wing mirror design, my bets, more flashy and sporty, but I think we will have to wait until Frankfurt Show 2013 to find out, just like the M5 the final wing mirrors were not shown at the concept stage about 6 months prior to its production world debut.
My predictions though.