I rewatched the E3 trailer and I happened upon a discussion in the comments about how the technical aspects of the game had changed (Mercedes' hair color, gambit animation, Edelgard's VA, the Monastery, etc.) but what really interests me is the story changes. Someone mentioned that the lyrics in Edge of Dawn had changed from "born as time betrays" to "knowing time betrays". And of course, the most blatant difference, that ending when Edelgard says "I will return here some day, my teacher. Promise me...that you won't forget me." is nowhere in the released ver.