Well, we have to remember that male Viera was a "not happening unless we can overcome what's making them hard to implement, and it is HARD" and we still got them along with confirmation that female Hrothgar are coming. Hairstyles were actually confirmed to be coming ("Soon") So we can except they're ACTUALLY working on them but either hit a snag or wanted to have both genders out to give them shared hairstyles down the line (I HOPE, gosh I don't want to think Viera would get gender-locked HAIRSTYLES when we've been getting pretty androgynous stuff for all the other races)