No. The 4 series and M4 are simply coupe versions of the 3-series and M3 line - confusing I know.
This is seemingly BMW's recognition of Audi's success in upscaling the A4 line (i.e. A5 , S5, RS5) and their ability to charge a premium for it. I expect the 4 series to be more expensive than 3 series by a good margin. It's sad to see the M3 badge become split, but it's the "right" move from a revenue / business standpoint...aka "Show MEee DaA Monneeyy"