World of Warcraft turns eight on November 23, and Blizzard would like to thank their community for joining them in celebrating eight epic years of adventure. To celebrate, players who log in to World of Warcraft between November 18 and December 1 will receive a unique Feat of Strength achievement and Celebration Package item. Using your item will kick off the celebrations by shooting off fireworks*, applying a (cosmetic only) tabard to your character, and granting an 8% bonus to experience and reputation gains from any enemies defeated while active.
*Use fireworks responsibly. Harmful or fatal if swallowed. If fireworks get in eyes, rinse in muddy pond water for 20 minutes, /dance, and contact your nearest Mistweaver, Priest, Shaman, Druid, or Paladin.