If the Sony a7s III still exists, then it’s going to have a massive update over the previous models.

We’re wondering the same thing you are: where is the Sony a7s III? With the Sony a7r series of cameras undergoing two other refreshes, the a7s series hasn’t seen a single update in years. We know it’s coming, but we have no idea when. However, with the launch of the Sony a7r IV, and the company’s emphasis on Speed and AI amongst other things, we can get a better idea of what the Sony a7s III could be used for and who it’s targeted to.
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https://www.thephoblographer.com/2019/08/06/the-sony-a7r-iv-is-out-so-where-is-the-sony-a7s-iii/