This may be a quadruple post, apologies in advance.
I hope something happens with Iron Bull having to choose and it being already decided based on main game choices. If I let the Chargers die and I'm not friends with Iron Bull at all, I expect him to join the invaders.
Unless the Qunari in this are like the Venatori - an evil secret cult / organisation that the rest of the Qun don't know about.
This.
I'm really hoping that decision you make about which way Bull goes has major consequences in this DLC. Because think about it, if you sacrificed the Chargers and pushed Bull back towards the Qun then they may call him in and he really should go... and take with him all of the intel he has on the Inquisition, its members - their skills, abilities, strengths and weaknesses - and Skyhold itself. After all, he's a member of the Qun, your Inquisitor made sure of that, and his loyalty is not to the Inquisition but the Qun.
I hope they do it and that it makes any battles against them extraordinarily difficult. Perhaps even to the point of a companion/advisor being killed. And what I'd really like in this scenario is if the Qun targeted your love interest specifically, knowing it will affect you deeply.
It's possible I may like decisions to have appropriately salty outcomes.