From what Larian said they did change some of their personalities and that if they weren't in your immediate group of 4 they wouldn't have a reaction to things for which you do while out exploring in the world. But I noticed that isn't the case with Lae" Zel who still seems to react to everything.
As for Shadowheart in addition to her personality, they raised her Dexterity to 15 when it used to be only a 9 but I believe that was it.
