As to whether we're going to see something people speculate about or hope for in Descent... Dunno? I get a feeling some may expect too much from this DLC. I myself try to approach it without really expecting anything other than a few hours of fun... Although I do think there might be a small twist or a reveal or two, maybe even of something nobody is really expecting.
Before I played JoH I thought it would be a mildly interesting new map that just had some more enemies to kill and some minor cool things thrown in for flavor. Instead, it offered lore, history, insight on the Avaar, and a look at the original Inquisiton and the eventual erasure that was placed upon it and the people who led it. I was pleasantly surprised at how well it managed to tie all things together, and for that reason alone I am expecting Descent to be more than just a few hours of fun. I also expect it will offer us plenty to discuss and speculate on. Not about Solas, sure, but there's bound to be a heck of a lot of other stuff that makes up Thedas and that has had our interest since Origins.
Tuesday will be all kinds of fun.