I wonder if we'll get a male Bi LI that seems to prefer the company of men more to women, since most of the Bi LI's seem to prefer women in past games, Zeveran, Isabela, Leliana. At least it seemed to me that they preferred women though I can't speak for Anders, Fenris or Merrill since I don't do Male Hawke playthroughs very often and when I do them I usually romance Merrill (never romanced her with a female hawke before) So I might be seeing something in nothing, and running on little sleep could make me lack in sense so I apologize if I'm just spitting out gibberish right now. Guess those three stood out in my mind for some reason when I think Bi LIs not really sure why though and at least to me they all seem to prefer women.
Anders is tough to place in this way because apparently his male and female romances are different enough that it gives two different impressions about him. A female PC might never even realize that he is bisexual, apparently. Add this to his female preference in DA: A and it seems like he has a preference for ladies. However, a male PC gets to hear about his past with Karl and little about women, so it's a tough call.
Fenris doesn't really give an impression of a preference either way. He speaks almost nothing about his past or his preferences. However, the fact that he ends up with Isabela if you are romancing neither of them, makes me wonder if he was intended to have a female preference too.
I would really like a bi male who has a male preference, personally. It's so rarely represented in media that it would be really refreshing. I'm not sure if I'm getting that vibe from IB, but I'm holding out hope.