Blizzard provided a movie of gameplay today highlighting a battle with Onyxia the Dragon.

WoW Gameplay Spotlight: Battling Onyxia the Dragon
Dragons are among the deadliest denizens of Azeroth - gigantic and graceful, cunning and terrible in their wrath. Onyxia ranks high among the dragonken of Blackrock, the brood of Deathwing, and is one of the most dangerous foes in World of Warcraft. In this featured snapshot from the game, watch a brave raid group take on this fearsome creature...and prevail!

You can view the entire movie here