lShadowheart's Daisy is male, she says "he" in the EA when you discuses the tadpole dreams with her regardless of the PC gender. She might not actually know the person too, as she has the same dream as the PC.
But it is quite interesting, as I think everyone else is seeing their "patron": Gale seems to hear Mystra (from the talk he has about it) Lae'zel sees her Queen. Astarion sees his master. Wyll says it's an old lover, but I suspect it's Mizora (I didn't bother validating it)
Shadowheart sees a dude she is very attracted to and not Shar. The only difference I can think of is that Shadowheart sees Shar as her mother.
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For DOS2, they didn't have all of Act 1 (all of Fort Joy Island) in at the start and eventually added everything until you take the boat. They wanted to have the Dark Fortress (called Ketheric' city in the game files, but Duegar Encampment in-game) in for the start of EA, but were not able to do so. I expect that to be the first drop of new content we get. As for if we will get all of Act 1, well Swen always talked about the EA being Act 1, not just half of Act 1...
I also don't think we have the 80 (possible) battles promised or the 596 NPCs (from the comparison with DOS2 EA).