The Collector’s Edition will come in a special box that contains many exclusive extras to enhance your adventure into Outland, including:

  * World of Warcraft: The Burning Crusade on both CD and DVD
  * World of Warcraft: The Burning Crusade Behind-the-Scenes DVD
  * The Art of World of Warcraft: The Burning Crusade Hardcover Art Book
  * Exclusive In-Game Pet: Netherwhelp
  * Two World of Warcraft Trading Card Game Starter Packs, plus Exclusive Cards
  * Map of Outland Mouse Pad
  * World of Warcraft: The Burning Crusade Soundtrack CD

Further details on the contents, as well as pricing and availability info, will be announced at a later date.
https://worldofwarcraft.com/burningcrusade/townhall/collectors.html.