Wild rumor: Sony A7sIV has no 8k, but first Alpha camera with new 2-layer sensor?

We know for a fact that Sony registered two new High End cameras in China: One is 100% sure to be the A9III ( announcement on November 8th or January at max). But it’s totally unclear yet what the second camera is. An obvious guess would be the this is the A7sIV as it’s the…...