This corresponds to yesterday's info about the M3 coupe replacement being designated as 4er.
Drawing out the lines:
2-series = Replacement for current E82/E83, i.e. upcoming F22/F23 coupe/cabrio
4-series = Replacement for current E92/E93, i.e. upcoming F32/F33 coupe/cabrio + Gran Coupe
6-series = Current F12/F13 + Gran Coupe
Even series-numbers are the premium coupes/cabrios/Gran Coupe. Odd numbers are for sporthatch/sedan/tourer/GT?
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