Panasonic has shared a teaser for a new Lumix GH series camera via an online launch event at 10am EDT for tomorrow, May 25, 2021.
Panasonic hasn’t shared much. In fact, the below statement is the only additional info they provide regarding the announcement:

‘We are committed to further enhancing the G Series lineup and performance of conventional Micro Four Thirds mirrorless cameras and lenses to meet the continuous demands of creators who value the strong advantage that only MFT can offer.’

According to rumors and leaks, Panasonic will introduce a GH5 Mark II, a marginally upgraded from the original GH5 released in 2017. Nokishita, which is one of the most respected rumors and leak sources in the photo industry, has published a set of specifications from what will be Panasonic’s next Micro Four Thirds camera, which is possible to see here: https://drive.google.com/file/d/1GPtPEuCoz-1HNyGaH-FPu93S-RnvD5ud/view