Here was the text in the email I received:
Ahead of their world premiere in September 2020, the new M3 Saloon and M4 Coupé have taken to the track for testing. Both show a significant increase in performance due to improvements in M TwinPower Turbo technology. Both Competition model cars will deliver 510hp and an 8-speed M Steptronic transmission.
The link I got took me to this page.
https://discover.bmw.co.uk/article/m-goes-up-a-gear
I am not completely surprised, this happened with the S85 and S63Tu engines in the various M5 and M6 cars only being available as a 6MT in LHD