As already rumored before, the upcoming Sony a7S III or a7S IV is expected to be announced in early 2020. Now according to SAR, first leaked image of Sony a7SIII is already available online. You can see that this camera is much thick than current a7 series cameras.
According to rumors, Sony a7S III will featured with 4K 120p video, but no 8K video. There will be also a cooling fan system in a7S III as Panasonic Lumix S1H. Stay tuned for more info.
via: SAR