Version 3.3 "Fall of the Lich King" wraps up the Wrath of the Lich King storyline. The last major patch before World of Warcraft's next expansion, Cataclysm, version 3.3 introduces three new dungeons within the Icecrown Citadel, quest tracking, cross-realm dungeons, new quests and achievements, tier 10 raid armor, the usual smattering of class and balance tweaks, numerous bug fixes, and more!
Watch the launch trailer for Patch 3.3 "Fall of the Lich King" here!
For more details on the update, get a full run down of the patch at the "Fall of the Lich King" section of the World of Warcraft community site.