If all we get is just ONE dialogue exchange between the two, or worse, one fleeting reference to their relationship, I'll be very disappointed. It's not just because they're my preferred romance, it's because of their story. Without this romance, I feel the game and Solas as a character just doesn't have that "oomph" or "wow" factor, or emotional involvement, that adds so many more layers to the story.
Here's someone - a freakin' GOD - who has been alone for who knows how long (he's called He Who Hunts Alone, for goodness sake!) and has messed up so much **** that the only relationships he willingly forms are with spirits... but he finds not only respect and understanding from someone whose people he looks down on because, well, they demonize him and have a lot of things wrong, but also LOVE. That's the very last thing I think Solas ever expected to find, especially with a little Dalish elf he almost inadvertently killed with his orb. She truly DID change things for him, and I think that scared him more than he would like to admit. He's got something important to do and she's a distraction because she's making him reconsider what he's apparently been working on for centuries. That's gotta be incredibly jarring for an immortal. If there isn't some sort of in depth conversation or special moment (with the romance outfit - come on, I gotta see that in game) it'll feel so... anti-climactic. And worthless. Like, well have all this emotional potential and now we'll take it all away lolz have some Varric chest hair. I mean thank you for the chest hair, Bioware, but give me some closure with Lavellan finding out who he really is and with him really coming to terms with what she means to him.
I don't expect them to ride off into the sunset together, but I'd like SOMETHING to happen... undoubtedly with tears, but make them sweet tears pls