Fall of the Lich King is the latest World of Warcraft content update, and is now live. Blizzard also has a new video to present this patch (3.3). Check out the Fall of the Lich King page and read the patch notes.

"The heroes of the Horde and the Alliance have faced unimaginable horrors and suffered terrible losses in their desperate struggle against the Scourge. Now the time has come to break through the fortified gates of Icecrown Citadel and confront the Lich King in the frozen heart of his domain. Follow Jaina Proudmoore or Sylvanas Windrunner through the Forge of Souls, Pit of Saron, and Halls of Reflection in an attempt to subvert the Lich King's army in a new multi-wing 5-player dungeon. Join the Ashen Verdict as they charge through the citadel's main gate to take on the Scourge's most powerful leaders and fearsome monstrosities in a new 10- and 25-player raid. Fall of the Lich King also introduces the cross-realm Dungeon Finder interface, new quest-tracking features designed to make it easier to find objectives, and much more."