that would be in line with divinity 2 I guess. I expect 8 origin characters myself whom you will meet in act I and maybe some (temporary) none origin characters whom you will meet in Baldur's Gate proper. I expect jaheira to be a NPC or maybe a temporary companions for a part of the questline. I wonder if Jaheira mellowed out in her stance of: If someone cuts down a tree down in the forest, I will kill the bastard who dunnit (or whatever her quote was xD). Based on what we have of act one I see only one more origin character (karlach I guess) who will join you at some point. Although she currently states only to join you once she gets her pursuers off her back.