Wrath of the Lich King content includes

- Master the necromantic powers of the Death Knight - World of Warcraft's first Hero class.
- Quest to level 80, gaining potent new abilities and talents along the way.
- Learn the craft of spell augmentation with the new Inscription profession.
- Brave the harsh new continent of Northrend, the icy domain of the Lich King.
- Engage in epic siege warfare, deploying mighty siege engines to lay waste to destructible buildings in your path.
- Transform your hero's look with new character-customization options, including new hairstyles and dances.
- Explore perilous new dungeons filled with some of the deadliest creatures -- and greatest treasures -- on Azeroth.

Along with the regular expansion pack, hardcore World of Warcraft fiends can purchase the Collectors edition. On the expansion pack gamers can expect these features;

- World of Warcraft: Wrath of the Lich King on DVD-ROM.
- The Art of World of Warcraft: Wrath of the Lich King, a 208-page book featuring never-before-seen images from the game.
- An exclusive in-game pet: Frosty, the baby frost wyrm.
- A behind-the-scenes DVD containing over an hour of developer interviews, the Wrath of the Lich King intro cinematic with director's commentary, and more.
- The official soundtrack CD, containing 21 epic tracks from the game, along with exclusive bonus tracks.
- A mouse pad featuring a map of the newly opened continent of Northrend.
- Two World of Warcraft Trading Card Game March of the Legion™ starter decks, along with two exclusive cards available only in the Collector's Edition.

http://www.worldofwarcraft.com/wrath/index.xml

Can't wait for it to steal all of my precious time.