I think BMW realized that despite the fact that the sedan sells less than the coupe, there is still a strong market for a small- to mid-sized performance sedan as evidenced by the RS4, C63, IS-F, and CTS-V.
On a related note, I've been hearing rumblings that the F82 coupe will retain the M3 moniker even if the non-M F32 coupe will be called the 4-series. Who knows.
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | JPN 240 ECU flash | Euro LCI taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem