If we don't get a the possibility of a good ending like the Morrimancers did I will be most annoyed. If male wardens get the option of having a happily ever after with their morally ambigous apostate partner, then so should Lavellans.
The situation with Solas might be a tiny bit more complicated^^
They could make it work somehow though I guess. The DLC could certainly have Solas reveal his true identity. And then turn their romance into an epic us-against-the-world type of suicidal lover's crusade. *g*
Problem with that is, I doubt the inquisitor will return in DA4. So she'd have to be on the sidelines somehow like the warden. It will still need to be Solas' mission. But would Lavellan really not want to be at his side for this? The warden is probably a lot cooler with letting Morrigan follow her nebulous goals. She doesn't seem to have a specific plan that could potentially get everyone killed. She seems to be doing research and experiments mostly. She somehow wants to preserve the old gods and change society but she's clearly still rather clueless what's really going on at the end of the game. If I was the warden, I would probably find it adorable. Now Solas, he needs somebody to watch him closely and keep the wolf on a tight leash or we're all doomed.
Then again, now that he's absorbed Mythal, he might not be the same person anymore...
Hm, I'm not convinced there will be a Wolf Hunt DLC. I'd like one but I don't need one. I accept that he has chosen duty over love. I pray he will remember my Lavellan when the moment for big decisions comes...