I forget, was anything formally announced when Prey started shooting? I wasn't following that one nearly as closely as I am Romulus, but I seem to recall most information regarding production crew, additional casting, etc. spilling out on Instagram over the course of the shoot.
I think we might have known Amber Midthunder and that's about it when production started, which is about on par with this. Cailee Spaeny's name was officially in the trades a couple months back.
Only time will really tell, of course, but it seems like these Hulu originals do shoot a bit under the radar, at least in comparison to other films coming from 20th Century Studios that are aiming for a wider, theatrical release.