Hopefully, osu-lsu's photos will confirm some of the new exit numbers. But if his photos don't include exit signs, I suggest putting it in the HB with OSM's exit numbers, which can be corrected later if there turns out to be an error. The new I-269 segment has been open for more than five months, and has been traveled by at least three of our users; time to put it in the HB posthaste, even with imperfect information.
By the way, a quick look at the aaroads forum to nail down the opening date found this video:
https://www.fox13memphis.com/top-stories/mississippi-getting-ready-for-brand-new-interstates-on-i-269/659021351It confirms that the MS 309 interchange is exit 18, and the I-22/US 78 interchange is 16A-B, just as OSM says. More digging in
its I-269 thread might pick up more videos, or at least user reports on exit numbers.