Patch 5.3 for World of Warcraft will introduce a brand new Battleground and several other goodies for players to enjoy.
The new Battleground is called Gold Rush and takes place in the Valley of the Four Winds with both teams fighting for control of the mines. The patch will also add a new arena, four scenarios, heroic difficulty level for certain scenarios, and an adjustment to how loot rolls work.
The full patch notes can be found here. The patch is still yet to appear on the PTR, but should be on there soon.