I'm finally caught up! Man, you guys are horny little buggers aren't you? Not that I'm judging, mind you.
In regards to my post earlier, I don't think a prior relationship between Dorian and Felix/Alexius is out of the question, just that it's not implied by the demo. I'm still hoping not though.
I don't know how I feel about these branching quests. I hope you don't miss to much in one run. Like, I hope there aren't too many quests that lock out other quests. I like seeing everything, but I usually always think there's one "best" choice in a situation and I don't like doing it differently. I'm totally cool with different endings and different choices in a quest depending on choices, but I don't necessarily like missing whole quest lines and areas so much. I hope it's more like, you can do almost everything, but you have to catch the start point before you do another thing. If that makes sense. 
I'm kind of with you. I might bring different people, do things in a separate order etc. but generally I kind of play the same way. For instance, in Origins I always save the mages as opposed to using the Rite of Annulment. If in Origins doing either of those two things led to different questlines, I would find it very hard to go back on that decision in a subsequent playthrough to experience the other quest, short of reloading (which would be tedious). Perhaps that's me being unwilling to roleplay with the best of them, but whatever.
I kind of wish that the events of the demo were canon because I'm in the position where I don't want to send Leliana if I can choose not to since things seem to not be going so great for our party, but Leliana also has some badass moments that I really want to experience first-hand.
I hate decisions.