Do you want to join a level 85 Arena team and PvP for some rewards? Then you should register for this year's Arena Pass.
"Registration for the 2011 World of Warcraft Arena Pass is now open. Remember, this year all participants in the Arena Pass have a chance to earn the exclusive Armored Murloc pet as well as the exclusive "Vanquisher" title, so get your team together and be ready for fierce competition."
For more details, check out the Arena Pass FAQ. Blizzard plans to launch the initial phase of the Arena Pass this month.