Here is an updated list of the remaining rumored/expected Leica cameras and lenses (see the previous lists here):
Leica S3 (past overdue)
Leica SL2 expected in September
Leica Summilux-M 90mm f/1.5 ASPH lens
New Leica M 35mm Noctilux lens
Leica is planning to release/resurrect more vintage lenses in the future (new APO lens and 135mm lenses rumored, also a new Leica APO Summilux-M 50mm f/1.4 Asph lens with closer focusing capabilities).
Leica L3 watch with a mechanical alarm complication
Leica Andy Summers limited edition camera
New Leica M mount camera with EVF is rumored to be in the works (already rumored before here): 24MP sensor, body similar to the M240. The camera will have a native M mount and will be offered as an alternative to the M10 (the pictures above are just a concept sent in by a reader). No new Leica M11 in 2020 but there could be a new Leica M10X with a 47MP sensor rumored for Photokina 2020 (not sure what X stands for – maybe “xtra resolution”).
Not sure anymore about the previously rumored Leica C-M full-frame mirrorless camera after Leica denied the rumors.