I happened to be up so I watched what I could of the Persona livestream. Apparently, dispite missing the first hour, I missed nothing other than the P5 Protagonist's anime name reveal (which is probably what they'll use in the dancing game as well); Ren Amamiya.
The last part had the good stuff. Finally got some shots of alternative outfits for the dancing games as well as characters that weren't shown before. People are upset because Goro wasn't in the trailer even though his voice actor was doing the stream. Come on, guys, he'll be in the game. He was the most popular character in a Japanese P5 poll, after all. They're just waiting.
As far as P3:D goes, no Strega, but I wasn't expecting to see them either this early, even if they will be in the game. We also didn't see femc, Shinji, or Koromaru. Hell, no Elizabeth either, even though we had Margaret in the P4 game and the velvet twins were shown in the P5:D trailer, so my guess is they're waiting to reveal her. Elizabeth's pretty popular so it'd be stupid not in include her.