World of Warcraft: Cataclysm will be in stores on December 7, 2010 and the time has come to prep for the official launch by implementing its first major patch. Players can experience many major game and user interface systems updates in the first official patch for the upcoming third expansion, patch 4.0.1.

General
 * Cataclysm Launcher Update
 o The new Cataclysm Launcher allows you to stream game data while you play. This will reduce the time you spend downloading, installing, and patching World of Warcraft. We'd like to get your feedback on the toolset and gameplay experience. Please head to the forums here for additional information: http://forums.worldofwarcraft.com/thread.html?topicId=26726066731
 * Reforging
 o Players can now visit special Reforging NPCs in capital cities located near Enchanting trainers. 40% of any one secondary stat on an item can be allocated to add a new secondary stat to the item. The stat being added cannot already exist on the item. An item cannot have more than one reforged stat at a time, though the Reforging of an item can be undone and changed.

Dungeons & Raids
 * Flexible Raid Lock System
 o Icecrown Citadel and Ruby Sanctum now use the new Flexible Raid Lock system. This system provides the opportunity for a character to defeat each raid zone’s encounters once a week. A character may now complete the encounters during the week with different raids of either 10 or 25 players.
 o Learn more about this feature by visiting our official forums here: http://forums.worldofwarcraft.com/thread.html?topicId=27026324753&sid=1
 * Icecrown Citadel
 o The Chill of the Throne effect has been removed.