IB might not be , He will bed anyone he is sure he won't break so that may still include Dwarves and Elves (we can hope right lol?) . Varric we only know doesn't have a thing for humans. so he may be gated just against them , without Bioware revealing it , all we can do is guess sadly.
And i'll admit for ME3 my Fem-Shep got screwed over and not in a fun way. Thane dies , Jacob just sucks , Vega wasnt a full LI sadly. Garrus while I loved his character and even his romance scene's still wasn't my favorite either , so really I generally went with Kaiden who I did like but still.... poor thane.
I would honestly be completely on board with the Varric fans, if not for the fact he would most likely be race-gated, and that he has his ongoing thing with Bianca (not his crossbow, but the woman whose memory he is still in love with). I'm not sure I'd be okay with romancing him knowing that he did, and always will, love Bianca more. Also, the fact that he is most likely not bisexual would also mean one less LI for gay or bisexual male characters, on top of most likely shutting out all women except for dwarves. I did adore him in DA2, so I won't be totally crushed if he's an option--in fact, not at all crushed. I just will be very unhappy about the romance situation for straight women who play elf characters, and of course the gay/bi men who will also get fewer options, if Varric and Iron Bull are both gated.
Another possibility some people have entertained is that Vivienne will not be an option at all, and three of the remaining unconfirmed males will be LIs. I don't see that happening, because it would reduce the number of potential LIs for straight male and lesbian or bisexual female characters.
Some speculate that Iron Bull is not a true romance, but I think it will turn out he is, albeit with a more Zevran type tone. Weekes said something about "being very open," and I think that may mean that the Inquisitor must also be open to other people being with Iron Bull at the same time, as well as... other matters. So he may be a non-monogamous, or more casual, romance option that may or may not get more serious. And yet, he's almost certainly a fully fledged romance.
So, basically, Iron Bull, Vivienne, and one of the three of Solas, Varric, and Blackwall. Could be any of them, but again I think Varric is less likely due to probable race-gating, which we can almost be certain will be the case with Iron Bull.