Kunchong are a popular one. I also mentioned armadillos (why no armadillo love?!), maggots, and those ooky bears that are infested with spider eggs. My Forsaken hunter's motif is that she tames and makes homes for diseased, rotting, or otherwise gross creatures... so more maggots and ooky bears are right up her alley.
dragonkin and the like. mostly like the whelps and sprite darters. kunchong, seems like a good fit for a new silithid. shoveltusks and yaks, maybe for goat family. i have to say i really like the spider/spider-demon model from the demon hunter starting area. looks like an armored spider. i think that would be awesome for the spider lovers.
Fear. Fear attracts the fearful. The strong. The weak. The innocent. The corrupt. Fear. Fear is my ally.
As far as hippogryphs go, lorewise they're meant to be sentient creatures like dragons, so I doubt we'll see them tameable (would prefer they weren't, tbh). But the dread ravens... yes please.
Being colour-blind, I'd really like to see some beasts with more "vibrant" colours and contrasts.
I can barely see red and green.. so any creature that has both those colours on it is just a muddy "bleh" to me. On the other hand, bright blues and yellows are shockingly vibrant to me.
Anything with strong edge highlights (like white outlines) gets added points from me.
I wish I could feel enthused by so many of the obviously passionate suggestions being made in this thread. I wish I could appreciate the colours. Sadly, most (I say "most" and not "all") of the creatures thus far listed here are just muddy blurs to me. I can see the shape, but the colour is entirely nondescript.
A bit of palindromic wisdom: "Step on no pets!" Casual player.. don't raid, don't PvP. Suffer from extreme altitis I love pets - combat or non. <That Kind of Orc> guild on The Scryers, small, casual LGBT and friends guild, join us Horde-side.