Two new stats have been introduced to PvP gear this expansion: PvP Power and PvP Resilience. For more information about these stats and the difference between PvP and PvE gear, see this helpful Blood Sport guide.
Wowhead has a preview of the new gear, where to get it, and the prices of all the pieces that are currently in game. Their model viewer will show you how the new outfits will look on your character, as well.
So assemble your teams and get to it! For the Horde! [Insert Alliance battlecry here.]
The full announcement from Blizzard is after the break.