Here are the major camera announcements from the 2018 Photokina show:
Ricoh GR III development announced: 24MP, coming in early 2019
Zenit and Leica present joint production camera (Zenit M with Zenitar 35mm f/1.0 lens)
Leica S3 additional information (full technical specifications)
Sigma to announce full frame mirrorless camera with L-mount and Foveon sensor
What do we know about the Panasonic S1/S1R full-frame mirrorless cameras?