Well as best I can remember, the Au Ra also couldn't access "standard" hairstyles at launch, they were patched-in at a later point. So I wouldn't really worry too much about the Viera, I'm sure they just want to be sure they look *perfect* before officially adding them, instead of risking them looking rushed.

Hrothgar are highly concerning, though. They're built differently enough, I can see where adding hairstyles could be problematic. But they're also clearly *VERY* limited in options; too much so to be usable long-term, I think.