Looks like M4 CS is confirmed for G8x platform and it might be a good news for people who were unable to secure a M3CS.
Source (@ynguldyn):
https://www.bimmerpost.com/forums/sh....php?t=901686.
"M4 CS will be in production 07/24-06/25. Virtually the same car as the current M3 CS but with two fewer doors and some headlight changes (no laserlights)."
With G8x having a longer production run, I would expect BMW to introduce another special limited run towards the end of the lifecycle as well.