Or at least the major races people talk the most about which are
Blood elves, Void elves, High elves
Night elves and Nightborne
Undead and Forsaken
Humans
Orcs
Trolls?
It will help with the many threads that keep popping up, because megathreads aren't good means to focus on a particular question or aspect you might want to discuss, but more like a continuous conversation that morphs. I think a sub-forum would be much better.
I also recommend it be in the lore section, because unlike classes, races don't really have much gameplay features.. racials are very very basic, compared to say covenants.
I'd would NOT suggest considering covenants have a sub forum that can later be folded into the main forum once the expansion ends because they are so tied to class mechanics, it might not be necessary as the issues would be discussed there