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Nethaera
Invincible Rising
Riding on the chill winds that flow around the frozen spires of Icecrown Citadel comes the once-noble steed of Prince Arthas Menethil. Now this beast, raised from its grave, bears the fearsome Lich King on its winged back. Even in undeath, it remains an ever-faithful servant. Learn more of its tainted history here.

http://www.worldofwarcraft.com/info/underdev/3p3/invincible.xml

FAQ

Q. Is the mount available in both 10 and 25 Heroic?
A. Invincible will only be available in the 25-person Heroic encounter with the Lich King.

Q. Is it a random drop or is it a guaranteed drop?
A. Much like Mimiron's head, one lucky player will be able to attain this incredible mount when the Lich King is defeated in his strongest form.
Crygil
Invincible Rising
Q u o t e:
Says heroic, but not how many players. 25 man only or both 10 and 25?


Invincible will only be available in the 25-person encounter with the Lich King.
Crygil
Invincible Rising
Q u o t e:
Well since heroic arthas is supposed to be OMFG hard, is it a random chance (Attunemen), an achievement that has yet to be implemented, or like Yogg0?


Much like Mimiron's head, one lucky player will be able to attain this incredible mount when the Lich King is defeated in his strongest form.