I did a thing, and I'm probably completely wrong/mostly wishful thinking, but here's my guess until we get more information:
Josie (Bi), Cullen (S), Cassandra (S), Sera (L), Dorian (G) - Confirmed.
Varric (Bi) - No Qunari. IB (Bi) - No Dwarves. Viv/Solas (Bi).
Straight F Elf/Human/Dwarf - 2 (Cullen and Varric)
Straight F Qunari - 2 (Bull and Cullen)
Gay F Elf/Human/Dwarf/Qun - 2 (Sera and Josie)
Straight M Elf/Human/Dwarf/Qunari - 2 (Cass and Josie)
Gay M Elf/Human/Dwarf - 2 (Dorian and Varric)
Gay M Qunari - 2 (Dorian and Bull)
Then bisexual Vivienne or Solas would make some of those twos into threes.
Despite my blatant assumptions that Varric and IB are bi and other obvious flaws, this would keep things pretty much even and explain the race-gatedness, and also perhaps give hope to people who desperately want to romance Varric. *Shrug* ... and now I wait for new info. 