The upcoming major content patch, Call of the Crusade, will bring a host of new features for World of Warcraft: Wrath of the Lich King.
* 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.
World of Warcraft - English (NA) Forums -> Blizzard Shop Talk - Under Development
I look forward to seeing what the Crusadar's Coliseum is.