I personally think they are taking the easy way out by doing an off-screen fix after the game. I don’t really expect any more changes to her storyline, since it’s looking like she was there to be fodder for either dramatic effect, or to let other romance interests (Lae’zel) have a good ending by letting her be the one to turn into a mindflayer. I just think they are phoning it in with the character and that is probably not going to change. And that the enriched infernal iron is just junk to sell. LOL. I actually would like them to fix the stuff that’s in the game that isn’t working, and polish some Act 3 moments, before they think about a DLC. Since they haven’t been polishing act 3 much in terms of existing content so far, I think that should be the priority personally.
It would make perfect sense for them to stick to an off-screen fix because in other cases, they go for other easy ways out, deus ex machina plot points for origin characters’ endings.
I mean Durge and Gale.
I'm not convinced we won't see an avernus dlc that lets us go to that forge and give karlach a good ending that doesn't just end on a cliff hanger. That being said I agree that it should be in act 3 maybe related to the house of hope in some way. Larian definitely did a half assed fix with the epilogue and that avernus ending but as long as it's a bandaid and only meant to lead into future karlach fixing content I'll be ok.