1)Tav and DU were divided. 2) cazador and his confrontation with the Butcher and Orin 3) cult Bhaal and Orin attacks cresh, Orin infects the dragon 4) Raven Queen Act 2 5) Hagse coven in BG 6) Baldurs Gate, maybe Averno 7) Minsc in Act 1 8) Gur story.
Bosses should have been placed like this Act 1 Ketrak Act 2 Orin at Baldur's Gate Act 3 Gortash
And its not all. In this time i looking for more information
And at first glance it may seem that there is a lot of content. But I checked the full list of quests, and I will say that this is just an illusion.
Where are you getting this info from? It sounds VERY plausible, to be clear, but also a bit too specific to be just a wild guess. And few things you are mentioning (i.e. Raven Queen) I'm not even sure what were supposed to be.
Datamined from the early access files. A particularly major alteration was the Guardian, where seemingly the original dream visitor, Daisy, was in fact
two entities -- the Absolute and Orpheus -- trying to talk to the player
and there was a lot more reactivity for, say, a no powers run.