A couple of new BGs are planned for Mists of Pandaria, as well as a new Arena in Uldum.
Resilience Change in Mists of Pandaria
Also, resilience is going to become a base stat for all characters, which will be further buffed via gear for those that wish to PvP competitively. The resilience change will make it so that anyone will be able to PvP without the need for PvP gear, however, you’ll likely have better success if you’re wearing PvP gear. 
As it stands now, unless you’re a highly skilled DPS class in full high-end tier gear, it’s nearly impossible to survive a BG without PvP gear. This change will fix that. 
New Battlegrounds in Mists of Pandaria
Blizzard has created concepts for three new possible BGs in Mists of Pandaria. It’s doubtful that they will add all three, but here’s a look at the ideas they’re kicking around at the moment.
Battleground Ideas for Mists of Pandaria
Stranglethorn Diamond Mines
This would be a new subterranean BG in Northern Stranglethorn. The objective of this BG will be to gather resources by escorting mine cars to various depots within the mine. The first team to reach X number of resources wins.
STV Diamond Mine Concept and Objective
The mining cars will spawn in the center of the map, with the depots located at opposite ends of the mine. Players will escort the cars down the various rails, with the ability to change their route at certain points along the tracks.
Imagine if Eye of the Storm was won strictly by flag running, and the FCs had to run on a variety of pre-determined routes. That’s kinda what the STV Diamond Mine will be like.
Map of the Stranglethorn Diamond Mine
Of course, the theme of this BG will allow for some interesting terrain and pitfalls. Sounds exciting!
STV Diamond Mine Concept Art
Valley of Power
The Valley of Power is going to be an all out combat slugfest – almost like a large arena match. Teams will enter an arena from opposite sides, then compete for the possession of a precious orb that will be located in the center of the arena.
Valley of Power Concept and Ojective
Teams will rush to the orb, grab it, then try and stay alive as the the other team competes for it. The Valley of Power will consist of an open area with 4 pillars, surrounded by a raised platform around the perimeter.
Valley of Power BG Map
The team possessing the orb will earn points based upon where they are located in relation to the map, as well as how long they hold it. Protecting the orb in the wide open center of the map will rack up the most points. Running to the perimeter of the map will allow for the fewest points.
Valley of Power BG Points System
The longer a team possesses the orb, the more points they’ll acquire. However, it’s also important to note that the orb will do damage to its carrier, increasing over time. It will be very important for the orb holder to have a few healers among their escorts.
The Valley of Power will be located in Pandaria.
Valley of Power Concept Art
Azshara Crater
Blizz hasn’t revealed much about this new BG, so no info on it just yet.
New Arena: Tol’Vir Proving Grounds
The Tol’vir Proving Grounds is going to be a new arena located in Uldum. It shares a similar layout to Nagrand Arena.
Tol'vir Proving Grounds
Tol'vir Proving Grounds - Side View
