Back on the topic of romances, I think it's likely that Solas may be a gated bi LI if Vivienne is in, but I don't think it'll be dwarves like some people have guessed. This is the issue with IB that I mentioned. David Gaider has been very clear in multiple places that they are determined to give everyone two options. In the panel, they said they used the chart to make sure everyone would have options, even by race. (The example they used was, "we can't do this, it would totally screw gay male dwarves".) Since IB was planned gated and we can be pretty sure it was against at least dwarves due to rigging, I think we can assume the remaining male wouldn't be gated against dwarves. They needed someone to fill that slot if IB went through gated, as planned. I would assume his gates are likely Qunari in this case.
Quick interjection: Allan has said that it wasn't always the case that each of the sexuality/race set-ups had choices.
I was being universal. No matter what type of character you wish to play (within the confines that we tend to, for better or worse, adhere to a binary gender convention) choosing your race will not deny you choices.
EDIT: At least I'm 99% sure this is the case (it wasn't always).... I'll need to confirm.
This is why I think they worked so hard to make the Iron Bull available to everyone, and why I think the other LI has a story-based restriction that cannot be written around. Because the Iron Bull was a size-related issue, I'm of the opinion that the last male LI is gated against male dwarves. Now, that could mean that the rest of the male LI's are straight (ex. Varric) or they're bisexual but gated against dwarves.
It's also why I'm very hesitant about Blackwall being an option, unless he's straight. I'm having a hard time figuring out what story-reason a Grey Warden would have for not being interested in dwarves.