From all that I've watched from the previews, the only thing that has yet to be confirmed story-wise is the mask system. Things like the number of dungeons and whatnot can't be confirmed until after the release.
However, one thing that caught my attention. Itsuno-san did say in his latest Famitsu interview that the game was majorly done by the time of its reveal, that the team is only ironing it out for the release, which confirms they delaying the game after Cyberpunk 2077 debacle.
This leak seems to be true. I remember calling it bullshit back in the day, so I'm glad I was wrong because the game is shaping up to be phenomenal.