How Big is Deathwing in World of Warcraft: Cataclysm?

If you're not much of a gamer, I reckon the wallpaper should give you an inkling on how big Deathwing in WoW: Cataclysm is going to be...

Question is, how the hell are the players gonna kill it?

http://wow.incgamers.com/gallery/data/500/medium/wow-cataclysm-wallpaper.jpg