While the attention of the Horde and Alliance remained fixed upon Northrend, an ancient evil has been lying dormant within Deepholm, the domain of earth in the Elemental Plane. Hidden away in a secluded sanctuary, the corrupted Dragon Aspect Deathwing has waited, recovering from the wounds of his last battle against Azeroth, nursing his hatred for the inferior creatures that infest the surface realm...and biding his time until he can reforge the world in molten fire.
Soon, Deathwing the Destroyer will return to Azeroth, and his eruption from Deepholm will sunder the world, leaving a festering wound across the continents. As the Horde and Alliance race to the epicenter of the cataclysm, the kingdoms of Azeroth will witness seismic shifts in power, the kindling of a war of the elements, and the emergence of unlikely heroes who will rise up to protect their scarred and broken world from utter devastation.
The face of Azeroth is altered forever as the destruction left in Deathwing's wake reshapes the land and reveals secrets long sealed away. Players will be able to re-experience familiar zones across Kalimdor and the Eastern Kingdoms, rewrought by the cataclysm and filled with new opportunities for adventure.
It's too early to say. We base our leveling more around how much quest content we have and how good the reward pacing feels. If we have as many quests as we did from 70-80 and if it feels like your character is getting a reasonable amount of new stuff for the time invested, then it could end up being similar.