According to the German site Bimmertoday BMW will be bringing to market a very special M2. The rumor is that the M2 will gain a defined version of the M4’s 3.0 twin turbo inline six along with a modified suspension and aero package. The M2 CS (as its rumored to be called) won’t likely be lighter than the M2 hence the lack of the full CSL moniker.
The model is expected to have 400 hp with similar gains in torque as well.
Rumors point to the M2 CS being a limited edition model to roughly coincide with the 2 Series LCI in late 2017. That said we wouldn’t expect a US market launch before 2018.