Getting tired of the same ol' arenas? Well, two new ones are now available: the Dalaran Sewers and the Ring of Valor in Orgrimmar. Here's the post from Nethaera:

With the latest patch release, we’ve added two new arenas: the Dalaran Sewers and the Ring of Valor in Orgrimmar. These arenas offer new obstacles and challenges for strategy savvy players. The arenas have been added to the random rotation and are accessible via the queue system as Skirmishes. For more information on these two new arenas, please visit http://www.worldofwarcraft.com/insider/11/arena.xml. Both Dalaran Sewers and the Ring of Valor will also be available for tournament play during Arena Season 5.

In the sewers, a waterfall pours down from a grate in the ceiling from time to time to block line of sight. In the Ring of Valor, combatants start the match in close proximity to each other.