Somebody is right now sending some Sony sensor specs to all possible websites. And of course we received it too.
An APS-C format stacked sensor, dubbed the IMX671-AAPH, appears to be a public version of the sensor used in the X-H2S.
This is a sensor that allows for high speed readout without DRAM, the same architecture as the IMX472 in the Olympus OM-1.
Perhaps Fujifilm can achieve greatness in high-speed photography in the future.
Down below you can see the full file I have received.
Again: I have received this anonymously. I did not plan to publish it but since it is spreading all over the web, I will share it now, even thought it is very likely a fake.