But I am intrigued to see where Larian takes Lae'zel and Astarion (hopefully not the same places they took Sebille, Fane, and Red Prince).
I am very curious about Lae'zels character arc,too. How will she react when she discovers that the githjanki never had an intent (or possibility) to cure her, and that "purification" means death?
In my first playthrough, I would not take Lae'zel in my party very often, because I was a bit annoyed by her arrogant, harsh behaviour (well, Astarion is arrogant, too, but at least he would not try to order my Tav to do something). When I finally let her join my party and talked to her, it was very interesting to learn more about her, to see where she is coming from.
She grew up in a society where she is constantly told the githjanki are superior to everyone else, where ruthlessness is rewarded, and she has little to none experience with people outside her own society. She practically worships her queen and believes her to be perfect, she deeply believes what she is told.
I was surprised when I realized how young she must be for a githjanki, and I think this shows in her enthusiasm when she talks about her wish to finally become a kith`rak and ride her own red dragon. And when she talks about her crèche, she almost sounds a bit homesick. Although my helpful, friendly Tav would disagree with her most of the time, she would feel empathy for her.
That does not mean I would let my Tav act contrary to her own convictions; I will still choose the options I have in mind for my Tav, even though they will certainly earn me Lae'zel's (or Astarion's, or sometimes Shadowheart's) disapproval.