The World of Warcraft Website reveals the Mists of Pandaria, a new expansion for World of Warcraft introducing a new continent, a new neutral race, and a playable monk class to the MMORPG. The Mists of Pandaria Website is online, here's a Mists of Pandaria Preview Trailer and here's a bit from the announcement:

In the upcoming expansion, players will be able to explore the long-lost continent of Pandaria, which has remained hidden from the world since the sundering of Azeroth over ten thousand years ago. In the aftermath of the Cataclysm played out in World of Warcraft’s third expansion, Pandaria’s heroes are emerging from their land’s lush forests and cloud-ringed mountains to choose sides in the escalating war between the Alliance and the Horde and to share the extraordinary secrets of their ancient martial arts. As tensions between the factions near a breaking point following the discovery of this new world, players will be called upon to explore Pandaria’s exotic expanses, make contact with its strange indigenous creatures, and unlock the world-changing secrets that have been hiding in the mists for millennia.

New features coming in the game’s fourth expansion include:

• New Playable Race -- Pandaren: Adventure through Azeroth as World of Warcraft's first neutral race and decide whether to side with the Alliance or the Horde.
• New Playable Class -- Monk: Unlock the secrets of pandaren martial arts and do battle as a damage dealer, healer, or tank.
• Level Cap Increased to 90:Learn potent new spells and abilities while exploring uncharted zones and taking on challenging new content.
• New Zones:Explore the lush Jade Forest, treacherous Kun-Lai Summit, and other exotic areas of Pandaria designed for high-level characters, and uncover the mystery of the Wandering Isle.
• Scenarios: Join up with some friends to achieve a common goal, such as mounting a defense against invading monsters, in a flexible new type of PvE challenge.
• Dungeon “Challenge” Modes: Master the ultimate five-player time trial to earn prestige rewards in a new dungeon mode that will put your resolve and coordination to the test.
• Pet Battles: Challenge other players’ companion pets with your own collection in a new tactical mini-game, and find out who's king or queen of the pint-sized battlefield.
• New Talent System: Customize your character to suit your play style with the newly overhauled and improved talent system.