The more accurate question is "What hasn't changed"? And things are still changing. Follow various YouTubers (AllEars, Disney Food Blog especially) and the Dis podcasts to keep track of changes. As of right now, in addition to new attractions and lands, the biggest changes are park reservations, 60 days booking window for dining reservations (this might change, this was a COVID update), update to Extra Magic Hours (after Oct 1, 2021, only Deluxe resorts get evening EMH), no Magical Express after Jan 1, 2022, and no dining plan (currently, but it might come back). Plus, the COVID situation is constantly changing - right now, masks are required indoors and on attractions but that can change. Also, not all attractions and restaurants are open, but things are opening back up. There are also no character meet and greets right now and character dining is limited.