How I would lol if this was a mount for a NPC and all this arguing was for nothing <.<
Anyway on the topic of where this thing could possibly be from, im guna take a few guesses.
My first guess is a quest chain for druids (I would love this since im a druid), would of made sense to place it with 5.2 though.
Second guess could be a world drop from the new world boss, though I don't see where it would fit in with it.
Third guess is that this could be the new mount for the annual pass. I don't know if they said the annual pass was a one off or not, and again if it was this it would of fit better with the 5.2 patch.
I doubt it is from:
SoO meta: Confirmed to be reins of Galakras.
Garrosh HC: Though I could well be wrong, but it doesn't seem to fit in.
SoO normal drop: Again it wouldn't tie in lore wise, and I think there was a scorpid mount datamined somewhere. A mount is also rewarded for killing garrosh on normal via the ahead of curve achievement.
TCG: According to
http://www.wowtcgloot.com/ there is no new tcg loot, only a new expansion with all the current loot. Forgive me if I could be wrong, I don't pay a lot of attention to TCG.
Blizz store: Blizzard recently released the bloodwing so it seems a little early unless this is similar to the bloodwing in a sense that they released its model early and put it up on the store months later. If this is the scenario then it would of made a lot more sense to release the stormcrow first given the patch of ToT.
Heck either way its an awesome mount regardless and I'm a mount collector so it doesn't matter whether or not its a druid form or mount.