Here a quick recap of the latest Leica announcements at the 2018 Photokina show:
Next is an updated list of the remaining rumored/expected Leica cameras and lenses (see the previous lists here):
Silver Leica Summilux-M 28mm f/1.4 ASPH lens
Leica Summilux-M 90mm f/1.5 ASPH lens
Leica is planning to release/resurrect more vintage lenses in the future (new APO lens and 135mm lenses rumored)
Leica Andy Summers limited edition camera
Not sure anymore about the previously rumored Leica C-M full frame mirrorless camera after Leica denied the rumors (update: as of October 5th Leica still has one registered but not yet officially announced camera model: Leica 3952).