It's difficult to read game's exact structure without playing the whole game, but I personally believe that what we have seen is most but not all of act1 and act1 will end at moonrise tower where nature of our tadpoles will be revealed, we will have to "commit" to our selection of companions and we will move to Baldur's Gate for act2 loosing access to act1 areas.
I’ve also been guessing act 1 will end with resolution of the Moonrise Towers plot. I’m not sure why I’ve had it in my head that there would be three acts, and that what we get in EA is only “most of” act 1. That is, whether it’s something that Larian have said and I’m remembering or I’ve just made it up! If it’s not a figment of my imagination, then it’s only struck me now that each act might revolve around one of the three chosen.
(BTW I’m still going to keep hoping we don’t have to commit to a reduced set of companions at a predetermined point until we get another confirmation that’s still the plan!)
