The team over at Blizzard has released a gameplay trailer for the release of Blackwing Lair.  It looks pretty intense!

"The black bragonflight. The mere mention of its name is enough to strike fear in the hearts of even the bravest adventurers. The cunning black dragon and undisputed ruler of his flight, Nefarian, has begun to unfold the final stages of his sinister plan to lead his army to supremacy over all the races of Azeroth. Now, watch a courageous band of heroes challenge Nefarian in his own sanctum at the very height of Blackrock Spire in this latest gameplay trailer of Blackwing Lair!"