New Races

[Ayuhra]

Remember, they were pretty clear that "This might be the Last chance we get to make a new race, because it takes Alot of resources to make them"
So if they just did Viera as a whole, then they likely wouldn't have the chance to make a Beast Race like they planned to. So they really couldn't Just make Viera now and do Hrothgar next expansion, because its very likely they wouldn't be able to.

I do remember them saying that but I still think fully developed Viera and Hrothgar would be doable if spaced apart.

And if not then good lord do they need to upgrade to a new engine and reevaluate the frankly baffling way they handle fitting gear to models.