A number of cloud serpents have been switched from dragonkin to beasts in this last build.
I say "switched" because these are pre-existing mobs, not new ones that have been accidentally set that way. What the developers' intention is in doing so, I don't know yet, but I wanted to set up a thread to track them.
All except a few special ones do seem more like wild beasts than sapient beings, and they're not like real dragons at all. I suspect that protodrakes in Northrend could easily have gone the same way.
Anyway, here's a list of the ones that are now beasts (and no, none are tameable. You wish!

)
Wild Onyx Serpent, Level 90 Elite, Mount Neverest, KLS - regular, black
Subjugated Serpent, Level 90 Elite, The Golden Stair, VEB (only on certain days) - regular, black
Alani <the Stormborn>, Level 92 Rare, VEB - lighting, red
Onyx Stormclaw, Level 90, Shan'ze Dao, TLS - regular, black
The Shan'ze Cloudrunners on Shan'ze Dao, Townlong Steppes. What happens on the island is the Mogu capture the Wild Cloudrunners (still dragonkin, four colours, different id for each) and convert them to Shan'ze Cloudrunners, which are beasts, still have four colours, but all are covered by a blackening aura, making them look a lot like the black cloud serpent, with a slight coloured sheen. As they fly up the mountain, they retain the id of their original Wild Cloudrunner (just with a new name and classification), which then despawns. The proper Shan'ze Cloudrunners circle the top of the island. Each colour has its own NPC id:
Shan'ze Cloudrunner, Level 90, Shan'ze Dao, TLS - regular, blue
Shan'ze Cloudrunner, Level 90, Shan'ze Dao, TLS - regular, green
Shan'ze Cloudrunner, Level 90, Shan'ze Dao, TLS - regular, red
Shan'ze Cloudrunner, Level 90, Shan'ze Dao, TLS - regular, yellow
Some of the (non-mount) cloud serpents that are still dragonkin or other classifications:
Hei Feng, Level 93 Elite, Shan'ze Dao, TLS - god model, black

Windward Viper, Level 90 Friendly, Windward Isle, JF - regular, green, red (maybe also blue and yellow?)
Young Cloud Serpent, Level 90 Friendly, The Arboretum, JF - regular, red (maybe also blue, green and yellow?) -
actually currently classed as humanoid



Windward Matriarch, Level 90 Friendly, Windward Isle, JF - regular, blue, green, red, yellow
The four Wild Cloudrunners, which for a short time are beasts renamed "Shan'ze Cloudrunner":
Wild Cloudrunner, Level 90 Friendly, Shan'ze Dao, TLS - regular, blue
Wild Cloudrunner, Level 90 Friendly, Shan'ze Dao, TLS - regular, green
Wild Cloudrunner, Level 90 Friendly, Shan'ze Dao, TLS - regular, red
Wild Cloudrunner, Level 90 Friendly, Shan'ze Dao, TLS - regular, yellow
Milau <Child of Alani>, Level xx?, VEB - lighting, red (currently classed as humanoid, in Guo-Lai Halls, not sure if appears every day)
And, as a reference, the other colours are:
PandarenSerpent_Black Lightning
PandarenSerpent_Blue Lightning
PandarenSerpent_Green Lightning
PandarenSerpent_Yellow Lightning
PandarenSerpentGod_Blue
PandarenSerpentGod_Green
PandarenSerpentGod_Red
PandarenSerpentGod_Yellow