The Krasarang Wilds is one of the two new zones added between the Mists press event and Blizzcon 2011. Originally part of the Valley of the Four Winds, it has been vastly expanded so that it is now an entire zone of its own. As can be seen in the video, it is a large jungle, but dark and mysterious as opposed to the bright jungles like Sholazar Basin and Stranglethorn that we’re used to.
A level 86-88 questing zone, the Wilds will also contain one of the new raids (The Terrace of the Endless Spring) and will be the staging ground for future patches. Supposedly over the course of this expansion, the zone will change to reflect the fighting between the Horde and Alliance. At the moment, Blizzard describes it thus:
The Krasarang Wilds along Pandaria’s southern coast conceal many ancient secrets of a lost dynasty that have drawn the attention of prophecy-seekers among the Alliance and Horde. The Wilds are also home to the vicious, domineering Mogu, and a more insidious danger still: the Sha of Despair is believed to have escaped from its bindings in the Temple of the Red Crane, and stifling gloom has begun to blanket the land in its path