During Burning Crusade we never saw a female model of
* Ogres
* Arakkoa
* Broken Draenei
* Ethereals
During Cataclysm we got really really shitty female Worgen, and also never got female versions of those Cat-centaur things in Uldum.
During Mists of Pandaria the Mogu were the focus of the expansion for the first half and we only saw females as a single raid boss.
I predict we'll never see female Ogres because Blizzard is run by white males. Blizzard has next-to-no diversity, which is part of why the alliance is made up of white cultures (except finally the Pandaren), and every other race in the game is a non-white racial stereotype.