Not much, but Version 1.02 seems to have fixed some nasty bugs that may or may not affect your own experience. First, it fixes screen flickering during gameplay, and the second fixes network errors that occur under specific conditions (via Nintendo Everything).
Since Persona 5 Royal arrived on Switch, Xbox Series X|S, PlayStation 5 and PC last year, it has sold over a million copies. If you haven’t played the game on Nintendo’s platform, we highly recommend it:
“Persona 5 Royal is still a game that we strongly recommend picking up as soon as possible. It’s easily considered one of the best RPGs of the past decade and you’ll be doing yourself a disservice if you quit. Miss.”