Since we are being forced to play as a Dalish elf, I actually think that gives a much better chance of him being race gated for elves or elves/humans and bisexual. The reason for this is that if you role play the Dalish as not willing to consider a romance with anyone other than an elf (which is consistant with how they are portrayed in the DA world), then you are stuck with either having to play a lesbian/bisexual female or have no romance at all. Would they really be that cruel or judgemental?
I played my city elf girl with that sort of prejudice in DAO. I thought it reasonable enough that since a human had tried to rape her, and the way humans treated elves generally, that she would never consider bedding a human. I couldn't actually bring myself to be mean to Alistair when he tried courting me. It seemed like kicking a puppy but I did try and play it as cool as possible until Zevran arrived on the scene, when the penny finally dropped with Alistair that it just wasn't going to happen with him.
I have a theory that bisexual characters will be race-gated to keep down on the number of individual cinematics that have to be produced, bearing in mind that would have to cater for male and female options. So if Solas was going to be a romance but available to all races, then he wouldn't be bisexual but heterosexual. However, that would leave gay male xenophobic Dalish elf with no love interest.
Still, I could be wrong, may be the Devs are going to pass judgement on people who play xenophobes by excluding Solas as a LI. You want to play a prejudiced elf, you die alone.
Not everyone who wants to play a Dalish who wouldn't romance a non-elf wants to do so because of xenophobia. My planned Dalish in fact would love to be friendly with everyone else, but elves are dying out--city elves and Dalish alike--and so if she romances anyone it will be an elf male, or perhaps she might be bisexual and romance a woman instead so that she won't bring elf-blooded humans into the world. Elf-blooded humans have it about as bad as the city elves themselves do, not really welcome with the Dalish, out of place with the City Elves, and frowned upon by the other humans. Sure, as a mage she could also likely prevent pregnancy, but I think she'd have a sense of duty to at least give a try to bringing more elves into the world, should the opportunity arise. And if the opportunity doesn't arise, well, she'll be just as happy celibate since romance and kids are far less important than keeping the world from falling apart. She'll also be a pro-City Elf character, despite being Dalish.
Point being, others may be thinking the way I'm thinking, and it has nothing to do with their character being afraid of, or hating, the other races, and is simply about that character wanting to preserve their own culture. I don't think there's anything wrong with wanting to preserve your culture or your people if you know that having kids with anyone not of your race will result in children who aren't your race but will be treated just as badly as if they were. Honestly, elves seem more like a species than a race to me, and so do qunari and dwarves. It would even make sense to me if an elf had no other reason for only being into elves than that they only found other elves attractive. That doesn't mean that they necessarily hate/dislike/fear humans/dwarves/qunari, just that they prefer members of their own race/species as sexual partners.
As to the poster who pointed out the Dalish being arrogant... In general, the ones we have seen are. But I don't think it's TRUE arrogance as much as it is defensiveness. They are dying out while clinging to a culture that is dying, and not a slow death either. Of course they don't want the humans/dwarves/qunari invading and ruining what few scraps of culture they have left. And of course, after struggling so hard to keep their shreds of culture alive, they aren't going to be all that welcoming to the city elves who they see as having given up on being "true elves." Does that excuse it? ... Well, no, but at least it makes them a bit more understandable. They try to think of themselves as being superior even though they aren't, because that's basically all they have left. I have a personal theory that the Dalish are descendants of elven nobility, while the elven commoners/servants ended up becoming City Elves, because they weren't the warriors and mages. They were just the riffraff, unable to defend themselves. If my theory is correct, it would mean that the Dalish disparagement of "flat-ears," and their reluctance to have city elves allowed into their midst, may go back much, much farther than simply the fall of the Dales.
So far i'm still optimistic, like I said. And at this point, the prospect of Solas not being an LI isn't that problematic to me. But that's only because I don't know enough about him yet to be really attached to the idea. But, I will be disappointed if neither Dorian or Solas are available. As that leaves only Iron Bull and Varrick as potentials other than Cullen (I'm actually really excited about his inclusion, but understand he's not everyone's cup of tea), and I have no real interest in either.
Seems an odd choice for Bioware to make - they've created some pretty good, attractive options for straight females in the past - so if the choice in this game is Cullen (mind you, i like him, but can see the other side, where he's this generically attractive, boring guy you may well dislike from previous games) and guys like Varrick and IB, who might only have a niche group of romantically-inclined female fans.
Not everyone who doesn't like Cullen dislikes him because he is bland. Personally I think he is kind of interesting, and he's attractive. My issue stems from the fact that he literally says that mages aren't people. I don't know if I will have a character who would be interested enough in him, or simply willing enough, to press further, since I'm already planning at least two mages (I may also play a rogue). If I were to play a warrior or rogue things might be different, but I am personally a bit put off by his attitude and that also makes a difference even if my characters would be okay with it. Again, I'm not a big fan of self-loathing in characters, whether mine or the dev team's.