The previously rumored 100-400mm SL lens and 1.4x L-mount teleconverter should be announced very soon (probably this week).
The new Leica SL 100-400mm lens will be priced at $2,500 and will most likely be based on the Sigma 100-400mm f/5-6.3 DG DN OS. The lens will be made in Japan.
The new 1.4x SL teleconverter will be priced at $999. Leica will introduce a second 2x SL teleconverter this summer with the next Japanese-made zoom lens.
Leica L-mount lens rumors: 100-400mm, 105mm, and teleconverters
The Leica Super-APO-Summicron-SL 21mm f/2 ASPH lens is already showing up online