Data mining shows that it’s Alliance only. My understanding is that mounts have tags based on who can use them so if they have both the “Alliance” and “Horde” tag then either faction can use it.
Kua’fon and Torcali have both tags but the Bee only has the “Alliance” tag. That was awhile ago so maybe the “Horde” tag has been added on since but last I heard, it was Alliance only.
So I am moderately allergic to bee stings. The last time I was stung was on my middle finger. My entire hand was swollen to about 2x its normal size with the middle finger even more and stuck up. Everyone had a good laugh (except for me as I though I was about to die with the whole not being able to breath thing).
It should be, Horde got more mounts to begin with in this expansion. Plus they mentioned this Bee mount in response to Alliance complaints about the bias and reskinned mounts that were far less good than the Horde versions which were more unique.