A few days ago I reported about the Leica SL event with Olaf Wolf & Alexandre Simoes that took place at Foto Koch in Germany on October 10th. At the end of the presentation, at the 1:09:47 mark, the Leica rep confirmed that a new Leica APO-Summicron-SL 21mm f/2 ASPH lens:
I was told that the new lens will start shipping in January 2023. The Leica APO-Summicron-SL 21mm f/2 ASPH lens has been on the Leica SL lens roadmap since 2018:
I am not sure if this will be the lens that will be announced together with the Leica M6t camera next week.
Several other Leica SL lenses are also expected to be announced soon:
Leica L-mount lens rumors: 100-400mm, 105mm, and teleconverters