They believe that Sony is likely to announce a new 100MP camera in 2022. This would have to be the new A7rV. I am not so sure about this yet. But we know Sony already has such kind of sensors in the works. Two years ago I reported about this new Sony sensor having 102 Megapixels and 6k recording. The specs are stunning:
2.91um pixel architecture, 100MP @ 10fps, 6K video using 12bit ADC with on-chip binning/line-skipping. 4K RGB 4:4:4 video with on-chip colour-aware binning.
This 12288 x 8192 100MP sensor employs a unique, CFA-based column-parallel ADC design:
The sensor is said to perform better than A7III in terms of dynamic range, sensitivity (QE) and readout speed. Here is the 4K RGB 4:4:4 readout mode: