The list author says: "World of Warcraft: Cataclysm is the upcoming third expansion set for the massively multiplayer online role-playing game (MMORPG) World of Warcraft, following The Burning Crusade and Wrath of the Lich King. It was officially announced at BlizzCon on August 21, 2009; however details were discovered earlier.
Much content is expected for release in the new expansion including two new races, Goblins for the Horde and Worgen for the Alliance, revamped zones, new quests and dungeons, new raids and newly accessible areas.
In a February 2010 Activision Blizzard investor call, Blizzard CEO Mike Morhaime revealed that Cataclysm would be released in that same calendar year.
On May 3, 2010, it was officially confirmed that the Family & Friends Alpha phase of the testing process for Cataclysm had begun, fuelling further speculation that the open alpha would commence within the coming months. Despite the non-disclosure agreement (NDA), much of the beginnings of the game were leaked onto various sources after the client was distributed across the internet within a few days of the alpha testing phase commencing. On May 11, 2010, it emerged that Blizzard had requested that at least one of these sites remove any alpha content until the NDA was lifted."
"Here's the expansion pack. You can pre-order it and lock in the $39.99 price. There's no guarantee that that's what the price will be if you're going to buy it locally, as Amazon tends to get good price breaks."