In this Japanese interview Marketing Manager Tomonori Nakanishi says (google translated):
We believe in the diverse possibilities of Micro Four Thirds, and we are developing such diversified products. In today’s world where full-size machines are becoming more popular in a sense, it may be a unique approach to develop the full-size lineup in-house and at the same time to develop the Micro Four Thirds lineup in full-scale. do not have. However, I believe that this approach will allow the “GH6” to establish a very sharp and unique position in the world at this moment.
Not sure if this means the GX7 and G9 will get a replacement in 2022/2023.