"Actually, I know that the last couple of months y'all have been waiting for something else. Well, your prayers have finally been answered: I can confirm that M2 CS will differ from the regular M2 in exactly the way you wanted. Though it'll be slightly detuned compared to M3/M4, to 400hp."
An aural preview of this came in the form of this M2 CS prototype recently spied testing on the Nurburgring sounding very much like an M3/M4 and not an M2.
In addition to the new engine, the M2 CS will feature other track focused bits such as suspension tweaks and aerodynamic parts - such as more aggressive front splitter and rear spoiler or wing. Expect a throatier exhaust and possibly optional carbon ceramic brakes as well.