Turns out Anivia also got a texture update in the 11/22 PBE patch! I apologize for missing it in the initial patch of PBE coverage and, since this is a pretty cool addition, I've stuffed it in it's own post for better visibility!
Team Spirit Anivia
Noxus Hunter Anivia
Here's a quick preview video for the updated skins, just so you can see them in motion!
[Note]: Blackfrost Anivia did not get a texture update because she already had a new, updated model.