The rumor site includes a link to DPR A7III studio scene.
Here's a direct link to DPR...
https://www.dpreview.com/reviews/sony-a7-iii-first-impressions-review
What they say...
"We'll be writing up our analysis of the a7 III's image quality (and any potential problems) in the coming days, once we've done a little more testing and real-world shooting.
In the meantime, our studio scene suggests* that, if the a7 III has an anti aliasing filter, it's
extremely weak, designed to only filter excessively high frequency detail in the horizontal axis. It'll be interesting to see what effect this has in the real world."