Blizzard has made an update to their Under Development page.

The Argent Tournament Expands: With the help of Azeroth’s heroes, the Argent Crusade will finish the Argent Coliseum just in time to call for all brave citizens to prepare for battle with the Lich King. New dailies, rewards, and more will be available at the Argent Tournament grounds to lure adventurers into the coliseum. 

Crusaders’ Coliseum: In order to prepare for a siege on Icecrown Citadel, players will be called by the Argent Crusade to test their mettle in the Coliseum. 5-player, 10-player, and 25-player challenges await inside. 

New Battleground: Isle of Conquest, a new large-scale siege Battleground, will be open. The Horde and Alliance will battle head-to-head for control of strategic resources to lay siege to the keeps of their opponents.

New Arena Season: Season 7 will officially start, paving the way for all-new items and challenges.

The new Arena Season undoubtedly also means a corresponding new Tier of PvE gear!  Will the next PvE raid be in the Argent Coloseum (complete with a new 5-man dungeon)??  =-O

I can’t even begin to imagine what an Argent Coloseum raid and dungeon will be like.  It must be something like Violet Hold, but awesomer.  The new Battleground also sounds very epic.  It sounds like it will be massive with at least 2 destructible keeps, which is what I always imagined Wintergrasp to be before it came out.  I was sort of dissapointed when I learned that Wintergrasp was just an attack/defend format.

Anyways, this is exciting news!  Bring on the new content!