I've been avoiding all the datamining on Karlach, so I'm excited to see what she's all about.
I think you are expecting the impossible, I see no indication Karlach can join the team until you hit Baldur's Gate and we won't be seeing that. But this is a thread of wishful thinking, I just think it's a bit odd to wish for the rest of the game in patch 5.
Maybe they will give us Moonrise Tower and some more polish on game mechanics and more races/classes.
A solution to jump+disengage.
The beginning of something a little less icky than the current rest system. At the moment the entire world is just standing round frozen until the action of the party make some of the world move, this might work with a DM, because he can adjust the world based on when the party arrives, but it's icky to have the entire world watchable and frozen in a computer game.