Blizzard has released patch 5.0.4 for World of Warcraft which among other things adds account-wide pets, mounts, and achievements to the game.
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From Blizzard
With this content update, players will be able to experience many new gameplay changes prior to Mists of Pandaria shipping on September 25. To get you started, we've recently published a patch 5.0.4 survival guide that details the major changes and introduces our new gameplay features.
Some of the major features of Patch 5.0.4 include:
New Talent System - The World of Warcraft talent system has been redesigned to allow for unique core ability and specialization choices
Class Changes - Many changes to character classes, including an array of new spells and abilities
Glyphs - Glyphs have been redesigned to be more specialized, while offering players fun and cosmetic customization options
Account-wide Mounts, Pets, and Achievements - Players now have access to (nearly) all the mounts, pets, and achievements they've earned across all their characters under one Battle.net account
Area of Effect (AOE) Looting - Looting has never been easier
Theramore's Fall Scenario - The first two Scenarios (one for Horde and one for Alliance) will be available for players to take on shortly before launch
Cross-Realm Zones - Cross-realm zones are a new technology enabling players to meet up and group with other players in underpopulated areas of the game world
BattleTag Support -Your BattleTag is a permanent, non-unique, account-wide nickname that serves as your identity when staying connected to other players using Battle.net's powerful social features