The manual will be easier to launch (just like it is in the M3), so 0-60 should be better. There is a chance that the manual will be a 7-speed. This would go in the E92 M3, E60 M5 and they would have a 550i 7-speed (they had a E39 540i 6-speed model), E63 M6, and possibly the new Z10 high performance car.
2006 Corvette Z06 Red/black
2006 BMW M5 Sepang/Sepang SMG III
2006 BMW M6 White/Black 6-speed