Iron Skyreaver - Available Now In-Game Through the Shop
It looks like this mount isn't on the US or EU Shop websites yet.
Originally Posted by Blizzard
(Blue Tracker / Official Forums)
Bred for war by brutal Iron Horde beastmasters and girded for battle in black steel and smoldering flame, the monstrous Iron Skyreaver suffers only the most fearsome of masters to ride it. Like a blazing comet foretelling doom and fiery destruction, hurtle down from the heavens upon this epic mount to herald your own campaign of conquest!
The Iron Skyreaver is now available for purchase from the in-game Shop! Once purchased, the mount will be available to all present and future characters on a single Battle.net account.