I've only finished Trespasser recently, as well. As somebody who played a Dalish Warden and then Dalish Inquisitor, all the new lore was a big shock. It's really hard to imagine how Lavellan (Mine was a mage, also.) can possibly deal with all she believed in crumbling like that and knowing Solas is responsible for destroying the world once already. We also know it was more complicated than that and we don't know the whole story. Probably by far. Knowing that he almost destroyed the world for the second time when he gave his orb to Corypheus. And now he's planning to do it again. It must be crushing and confusing. To me it feels that losing an arm is the Dalish Inquisitor's smallest problem in this story. That's why, while it was slightly disturbing for a moment, it made the fact that Lavellan could get back up on her feet and decide to continue the fight so much more badass. I feel that a devout Lavellan loses a lot. A devout Lavellan that fell in love with Solas loses even more. To me, that makes Lavellan's character development really fascinating, romance or not.
My Lavellan (who was Solas' friend) told him that as long as she lived, she would come to stop him. He said he knew that. He saved her regardless. And, yes, he's obviously not happy about this development, either.
I'm quite curious about what we'll learn in the following game because I agree there are too many unanswered questions still floating about.
Lavellan's character development is just out of this world. I've played as human and qunari, and I can't experience the story any other way now.
If the orb was not destroyed...Solas would have taken it, run, and torn down the veil. After you and your people risked everything, after the blood, the sweat, the tears, the sacrifice, he would have undone all of it. There is no betrayal more deep, more profound. He deserves to be hunted, and probably should be. My Lavellan's faith was very important to her, and now with that gone, the faith she has left is in the people she loves -- including Solas. She's always taken a principled stance on redemption, and she bears Solas a love and loyalty he doesn't deserve. All my canon characters have done something stupid for love, romantic or otherwise, so it fits with the theme I seem to have going here.
I'm really looking forward to DA4. I suspect that we'll learn Solas is even more grey than he appears, that his plans will fail, again, and he'll unleash a major problem that he may or may not assist us in correcting, in one form or another. I wouldn't be surprised if we see Flemythal either, in one way or another. I also hope we get more insight into the Forgotten Ones/Forbidden Ones/Old Gods. I'd really like to know why Solas hates what the Wardens are doing.