Facts:

1. Yugiri has a reptilian tail. The root of it even has spiky pointy bits, like a lizard. She is obviously not a Viera.
2. The pointy things on her head are floppy. They are therefor not horns. Ears seems likely, but they could also be ornaments. We don't know yet.
3. ARR has used 'wrong' character models/animations before. (I felt deeply betrayed about Nael.)

Bonus Fact:
Thancred is a Bard. He says so himself. Seems a bit spoony, but what do I know.

Bonus Bonus Fact: Beautiful April Fool's on the forum, I approve.