The BMW M Boss said the M3 and M4 will have a manual transmission:You're probably thinking about this: https://www.bmwblog.com/2019/05/13/...heel-drive-version-and-a-manual-transmission/
Unfortunately, all he confirms is that they built test vehicles with RWD and manuals. I knew it months before he said that. However, there's been some culling done recently to the G80 lineup, and what is not clear to me is which of the previously tested versions are going to remain and reach series production. My best interpretation of the information I have is that the mid-power version was dropped, and the "Pure" (may no longer be its name) version retuned for more power. The question that remains is what other changes were made to that version.