World of Warcraft : Cataclysm | Blizzcon 2010 trailer (2010)

just in from Blizzcon 2010
from the press release
An ancient evil lies 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 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.
 
Blizzard Entertainment's third expansion to World of Warcraft forever alters the face of Azeroth, 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, areas rewrought by the cataclysm and filled with new opportunities for adventure.

In an effort to survive the world-shattering cataclysm, two new playable races -- worgen and goblins -- will join the struggle between Alliance and Horde. As players journey to the new level cap of 85, they'll explore newly revealed zones, acquire new levels of power, and come face to face with Deathwing in a battle to determine the fate of the world.
 
Key Features: 

• Two New Playable Races: Adventure as one of two new races -- the cursed worgen with the Alliance, or the resourceful goblins with the Horde.
• Level Cap Increased to 85: Earn new abilities, acquire potent spells, and tap into new talents.
• Classic Zones Remade: Familiar zones across the original continents of Kalimdor and the Eastern Kingdoms have been altered forever and updated with new content, from the devastated Badlands to the broken Barrens, which has been sundered in two.
• Revamped Talent Trees: Every talent tree has been significantly overhauled, giving players clearer and better class customization choices than ever before.
• New High-Level Zones: Explore newly opened parts of the world, including Uldum, Grim Batol, and the great sunken city of Vashj'ir beneath the sea.
• New Race and Class Combinations: Explore Azeroth as a gnome priest, blood elf warrior, or one of the other never-before-available race and class combinations.
• Guild Advancement: Progress as a guild to earn guild levels and guild achievements.
• New PvP Zone and Battlegrounds: Take on PvP objectives and daily quests on the island of Tol Barad, a new Wintergrasp-like zone, and fight for glory in two new Battlegrounds: Twin Peaks and The Battle for Gilneas.
• Rated Battlegrounds: Prove your PvP prowess to earn fame, Arena points, and potent upgrades.
• Archaeology: Master a new secondary profession to unearth artifacts and earn unique rewards.
• Flying Mounts in Azeroth: Explore Kalimdor and the Eastern Kingdoms like never before.