there’s a related feature request for projects: https://forum.inaturalist.org/t/add-feature-to-include-discoveries-trends-on-projects/22109.
they sort of have this functionality already in some cases in the Discoveries section of the Trends tab in some taxon pages, but even when it’s available, it doesn’t work very reliably unfiltered, at a global level (probably because there are so many identification records). see: https://forum.inaturalist.org/t/automatically-adding-to-news-on-project/22028/4
the underlying feature is available through the API, too, but there are some quirks to it. see https://forum.inaturalist.org/t/how-to-find-out-of-range-observations-wiki/4271/2.
when i use it filtered for my local metro area, about half the time there are new species identified, they’re incorrect IDs based on computer vision suggestions. another portion are cases when there are taxon changes, and occasionally you do get new species (but usually there’s not that much discussion in these observations, though maybe there would be more discussion if it was a first in the entire system, not just in a particular place).