According to recently rumors, Panasonic will announce a new L-mount full frame mirrorless camera next week on May 31, 2019. This new L-mount full frame mirrorless camera is designed for cinematography.
dpreview has posted their CP+ interview with Panasonic. The main topic is about Panasonic’s full frame mirrorless cameras: S1 and S1R, and L-mount lenses: Panasonic S-line lenses, Leica L-mount lenses and Sigma L-mount lenses. You can see the full interview here.