This year ealier, BMW rolled out its M4 CS, which is lighter and track-focused version of its M4 coupe. The M3 is getting the CS treatment too as as predicted and it's headed for the United States of America. It is 110 lbs lighter than the standard M3 thanks to a carbon fiber-reinforced plastic (CFRP) roof, front splitter etc.
We've got this video which illustrates this car, it's specs. Watch this complete video.