Cosina is rumored to announce a new Voigtlander NOKTON 50mm f/1.0 Aspherical VM lens for Leica M-mount in January 2022 according to Nokishita.
Currently, there are two Voigtlander Nokton 50mm lenses for M-mount - one with f/1.2 and one with f/1.5 apertures (they used to have also the Voigtlander Nokton 50mm f/1.1).
Update: added leaked picture.
Via LeicaRumors