I haven't heard much from AZ peoples waiting for 2021 M3s, but received my VIN this morning for a white, LR, FSD, black interior. I ordered on Oct 17th, have an old ford as a trade in that isn't worth anything.
Like a few others, over the last day or so all forecasted delivery dates disappeared, then the VIN this morning. The dates have disappeared two other times over the last few weeks, only to come back with later forecasted dates. This time came back with a VIN and a delivery date of Dec 16-21st.