I would love new bear models... I've been using my lovely white bear since Wrath when I was inspired to make an 'ice' troll hunter and I love her to bits but I've wondered what she'd look like with a model upgrade once we had the new tiger models revealed. Bears are definitely up there on animals I'd kill for a upgrade on. They already look great imo as they are now, I don't mind any of the animations, I'd just like a bit of a smoother and more detailed skin and better teeth (maybe an ice-white bear too instead of the yellowy-browny-white? I've learned to sweep that under the rug to love my bear but it's still an ever present thing that I'm not really big on)
Maybe upgrades to birds of prey and carrion birds too, give the wings a bit more freedom of movement. They're really big what with the Arakkoa being a major sentient species. Maybe new Ravager and Raptor skins... Windserpents... Warp Stalkers (though these might be results of the Nether's twisitng properties), Nether Rays (again, probably a result of the Nether's energy)
There's so many tameable beasties that could get worked on, on the side for this expac that I'd do flip flops for
But I think a lot of upgraded skins might end up on the back burner as they try to push out new player models D: We might only end up getting new boars, new wolves, and new chimaera for tameable pets (chimaera's being a big 'if')