"Autozeitung" and "Auto Motor und Sport" quotet in their last issues the following release schedule for the M3 variants:
1. M3 E92 Coupé
2. M3 E90 Sedan
3. M3 E93 Convertible
Sedan release differs between End of 2007 (Autozeitung) and March 2008 ( Auto Motor und Sport)
Convertible between Geneva 2008 (Autozeitung) and June 2008 (auto Motor und Sport)
I think both meen German/Europian release dates.....
greetings Uli