As noted on the World of Warcraft Website, a new patch is now available for World of Warcraft to update Blizzard's MMORPG to version 3.2.2. Here are the full patch notes, and downloads of a manual 3.2.2 for the English edition of the game are available on Big Download, FileFront, and The Patches Scrolls, and various other localized patches are mirrored on FileFront and The Patches Scrolls. The US Mac patch is mirrored on Big Download. Here's word on the update from the official website:

After years of lurking in her lair, battling brave adventurers who travelled from afar, Onyxia has been reborn -- and she’s stronger than ever before. To commemorate the upcoming fifth anniversary of World of Warcraft, the classic Onyxia raid encounter has been updated in the newly released patch 3.2.2.

        • Onyxia has been retuned to offer new challenges to level-80 players (in both 10- and 25-player modes) while keeping the fundamental experience of fighting her intact. Beware the Deep Breaths!
        • Onyxia will now drop new level-80 gear featuring the aesthetics of loot from the original encounter.
        • The luckiest adventurers will have a chance to receive the Brood of Onyxia, a very rare 310%-speed mount modeled after the Brood Mother herself.