Originally Posted by tjw5687
It will be a M4 instead of M3
No, this is incorrect.
There will be both an M3 and M4 this time around due to the separation of the 4 door and 2 door (excl GC) F3x models into the 3 series and 4 series respectively.
This is exactly the same as we have both an M5 and M6 that derive from the 5 and 6 series.
The M3 will launch first, in mid 2014 (US), while the M4 is expected to follow up sometime in 2015 (US).