The M3 badge should live on as a performance version of the current 3-Series sedan, but the M3 coupe will be laid to rest as BMW transitions its two-door offerings to an even naming scheme. As such, the car that will eventually replace the M3 coupe will be badged as the M4.
The M3 coupe was introduced for the 1986 model year as a variant of the E30 3-Series, and continued on for each of the next three generations of the 3-Series. The current M3 coupe has been in production since 2007 and has sold more than 40,000 units worldwide.
The M3 coupe-replacing M4 will break cover by either the end of this year or in early 2014. Like the second- and third-generations of the M3 coupe, the M4 is expected to make use of an inline-six engine, albeit with two or three turbochargers strapped to it.
Look for the M4 to arrive in BMW showrooms in about a year from now.