0-60 in 3.7?
Keep dreaming guys
The fact that R&T got the E92 to hit 3.9 is irrelevant; they had a perfect launch, strong motor, perfect conditions (weather, elevation, tires, humidity, etc.).
New M3 will be advertised as a "4.2-4.3" 0-60mph car, with mags hitting 3.8 or so, maybe 3.9 again, one lucky magazine might get it to 3.7, again, with perfect conditions and settings.
Current M is advertised as a 4.7[4.5] 0-60 car (latter being DCT); marketing alone says they won't drop down half a second! They'll cannibalize their own brand.
If BMW wants to steal C63 AMG (w/ Performance Package) sales, they should advertise this car as a 0-60 in 4.2 car. And if they have a brain they should offer a Performance Package for extra HP/TQ like AMG does. Everyone would buy it.
Car will also be heavier than the current one.
'12 CLS550 Palladium Silver - loaded
'11 E92 M3 ZCP - SG/B-EXT/CF, M-DCT, loaded
'11 E93 328i, BSM over Saddle Brown, sport, loaded
'08 550i M-Sport, Carbon Black (Gone but not forgotten), '06 W211 E55 AMG (Gone, miss this animal),'01 E39 540i Sport