Traveler gave us a look at what female ogres look like:
Besides, plenty of races are patriarchal (quilboar, dwarves and trolls) but still have female models. Honestly though, as much as I like ogres, at this point I think I'd rather just see Mok'nathal added as a playable race or even just a subrace. Maybe then they could give the Alliance half-elves (since high elves are pretty rare and likely won't ever be playable).
Obviously you can modify their models to make them look unique enough from orcs and ogres or humans and Thalassian (b/h) elves while allowing them to retain a little of both identities.