Our fellow fansite WorldofWar.net has a 6-pages Wrath of the Lich King Hands-On Preview. Maticus was among the press representatives who visited Blizzard Headquarters recently to witness a private meeting with Jeff Kaplan and Tom Chilton, and to play the game.
In this preview, they explain step by step their video. This is pretty much the same video from Gamespy—who edited it into 6 mini-videos. Worldofwar shows them as a single bigger video. While you are at it, their WoWTV seems to be like a Wow-version of YouTube. Make sure to register an account.