What are the features of World of Warcraft: Cataclysm?

Some of the new features of World of Warcraft: Cataclysm include:

* Two New Playable Races: Adventure as one of two new races–the cursed worgen with the Alliance or the resourceful goblins with the Horde.
* Level Cap Increased to 85: Earn new abilities, tap into new talents, and progress through the path system, a new way for players to improve characters.