DIYphotography spotted a recent interview with a Panasonic executive who claims that Panasonic is still committed to Micro Four Thirds and the GH6 (GH5 replacement) is still in consideration:
Nearly 3.5 years have passed since the launch of the GH5, and many customers are still purchasing GH5, but many creators still shoot movies in a Micro Four Thirds format. As I have assured many times, we will continue to develop products for Micro Four Thirds as well as Full Frame to meet the needs of a wide range of creators. Regarding the replacement model for the GH camera that you asked about, I will inform you but the information may be spread. Of course, we are considering it, and we look forward to seeing you there.
Panasonic is currently ongoing a big restructuring and it will be interesting to see what will be left of their MFT business after they are done. You can watch the full interview here: