One more year and the entire World can legally drink.

November 23rd marks the official date for when World of Warcraft turns 20 years old, but that isn't stopping Blizzard from getting the party started early. Starting right now, players are able to take part in a number of various in-game activities that celebrate "two decades of adventure." This is all included in the first content update for World of Warcraft: The War Within, the game's latest major expansion.

Players are invited to visit the Caverns of Time where the celebration is taking place. There are new rewards to earn as well for those that tackle some of this 20th Anniversary content:

• NEW CLASSIC RAID: Blackrock Depths
  • This classic era dungeon has been refashioned into a 10-15 player 8-boss raid available in LFR, Normal and Heroic difficulties.
• NEW TIMEWALKING: Classic Dungeons
  • Classic dungeons will be offered in the LFD group finder and will officially enter the Timewalking rotation beyond the anniversary event.
    • Deadmines (original classic version)
    • Dire Maul (east and west wings)
    • Stratholme (living and undead wings)
• NEW WORLD BOSSES
  • Additional raid bosses are making a return with updated rewards in addition to previous anniversary raid bosses:
    • Sha of Anger (from Mists of Pandaria)
    • Archavon the Stonewatcher (from Wrath of the Lich King)
• LEGENDARY REWARDS
  • New mounts, pets, and classic transmog sets will be available to earn using a new currency, Bronze Celebration Tokens.
  • Additionally, updated modern versions of the Tier 2 armor sets will be purchasable with Bronze Celebration Tokens, available for all classes with new ones created for classes that were not available in the classic Tier 2 era!

More broadly speaking, the 11.0.5 update offers several other changes that have nothing to do with the anniversary celebration. These changes include class balance updates, new quests, and the addition of the Dracthyr race into six new combat classes including rogue, mage, and priest.

For you Shaman players out there, you will be happy to see that all Ascendance forms have been updated.

The full changelog for the 11.0.5 update is on the World of Warcraft site. As usual for these updates, the changelog is massive.