Source: WoWInsider
To celebrate the fourth year anniversary of wow, Blizzard is giving out these pets to every current subscriber of wow along with a "Feat of Strength" achievement.
If you're on an oceanic server you may have already gotten this, if you're not you'll supposedly get it at 12:01 AM November 23rd.
As far as I'm concerned, this is a sweet ass pet. My question is whether every future subscriber will get it. If not, this could certainly add some value to a WoW account.