We have a picture of the construction by elektrologish on X https://x.com/i/status/2079583518842134920
Seems like it will be 4 pull-through spaces with dedicated units under a roof, like Porrentruy and Pertit.
There's even a sign announcing the opening for August 11!
Now I'm not sure how I concluded in 2023 that this was the location used for GOFAST's 2019 render, because the background doesn't actually match. I have gone through the rest stop list again, and it must be Oberengstringen, because the buildings, lamps, tree and trash bin match.