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The issue we have today is that in general the standard car of the M4 has a lot of lightweight material technology incorporated. So when the next stage of evolution occurs ( M4 GTS ) they add more lightweight materials and then bring the (M4 CS) with the M4 GTS complexities removed.

In general the M4 is effectively a light car compared to its competitors because it is also a showcase for BMWs carbon fibre proficiency.
The dilemma is how low can they go in terms of taking out further weight?

If we look at the M4 GTS and CS from a birds eye view the entire top section of the car -hood-roof-trunk is CFRP which is an achievement for BMW and its proficient and significant investment to increase its competitive edge over its competitors.
Testament to this is the adoption of a CFRP roof which has been available albeit limited from the M3CSL to be introduced on the M3 E92 and E63 M6 and onwards.
This is significant because Audi has introduced a CF roof with its new RS5 so they are about ten years plus behind.

With the M2 they can and will remove weight but it will be again possibly a staged process. The M2 CS will capitalise on the attention M4 CS is receiving. In philosophy they are the same but the M2 CS will have its character and appeal enhanced which would probably lead the M2 CS to be more awaited than the M4 CS but both cars should not disappoint and provide exactly what you expect.