World of Warcraft: Blackwing Lair

Background

World of Warcraft: Blackwing Lair is the expansion for World of Warcraft, which will have many new features and is free of charge.

Features

The introduction of the PvP Honor ranking system and many exciting Honor rewards.
Our newly released PvP Battlegrounds. Warsong Gulch, a frenetic 10-vs.-10 "capture the flag"-style Battleground, and Alterac Valley, a 40-vs.-40 epic-scale battle for dominance.
Two new full dungeons (Maraudon and Dire Maul)
New world raid encounters (Azurgos and Lord Kazzak)
World events such as Feast of Winter Veil, the Elemental Invasions on Kalimdor, Children's Week, the Gurabashi Arena Event, and Noblegarden.
Many improvements to the game's user interface, such as additional action bars, quest tracking, and buff timers.
Over 200 new quests for all levels.
Over 600 new items, including new professions recipes, epic mounts, and raid sets.
Over 200 new monsters.
12 new flight paths.
Numerous new class abilities and class-balance adjustments.
Improvements to many of the dungeons already in the game, such as Scholomance, Stratholme, and Blackrock Spire.