It’s completely uncertain if Sony will show the new A7sIII at the NABshow
The following rumor is from the same source whom shared the correct 100mm STF lens rumor. He told me this:
α7sⅢ will have new stacked image sensor with integral memory and will have High ISO sensitivity and improved AF.
I know this doesn’t tell us anything useful yet. I hope to get some solid specs soon.
Just some fun: The First April A7sIII specs from Filmmakers.pro: