WoW - Wrath of the Lich King - Drak'Tharon Keep Video @ TTH

TenTonHammer has a 20 minute walkthrough video showing off the Drak'Tharon Keep instance from the Wrath of the Lich King beta:

The instance can be completed in a little less than an hour, despite having 3 required boss fights and 1 optional one. This video shows several of the groups of creatures that you fight as you move through the instance and all of the boss fights. It also shows the quest ending cinematic at the end where you get to face Arthas himself.