I might be the only one that thinks so, but I really don't see anything wrong with the way the viera were shown in that trailer. Compared to all the other females in the game (barring roe and highlanders), they do have a fiercer edge to them. I think people forget that Fran isn't indicative of the entire viera race. She's incredibly badass and aloof, but not every single viera is the same way. Even in XII the viera in Eruyt Village showed a different temperament than Fran.

I think the goal with the XIV viera was to make them very feminine and beautiful, but with a fierce edge to them. They have a real confident air about them too. I think that frustration emote did a good job of showing that. They weren't aiming for a "they're gonna rip your balls off" vibe. :v That's unique to Fran.