https://newatlas.com/ricoh-gxr-leica-m-mount-release-date/19475/
Ricoh announces release of Leica-M compatible GXR lens mount
May 2, 2015 - Ricoh has announced a September release for its new M-mount lens unit for the GXR modular camera system.
leica mricohannouncesreleasecompatible