The accessibility nutrition labels are about 10 years overdue! Good to see Apple taking a page from the gaming industry now supporting standard accessibility tags.
I would hope this could be a server side change to the app store and not require an iOS update. Did the similar privacy labels require an update when they were added? I don't remember.
I'm also interested in the new Braille Access thing although it doesn't really make sense to me right now. I also like the ability to temporarily share accessibility settings: That will be great for when you need to borrow someone's device to troubleshoot or use a kiosk, although I've never come across an iPad one.