Panasonic introduces a new LUMIX S-series camera, which, as it claims, "combines the video quality of a professional camera and the high mobility of a mirrorless camera". This is because it is capable of recording 6K video at up to 24fps, which still maintaining a full-frame unit's form factor. It will be released some time after summer in 2019.
https://www.notebookcheck.net/Panasonic-unveils-the-LUMIX-S1H-the-world-s-first-6K-24p-digital-single-lens-mirrorless-camera.422913.0.html