The WoW 2.1.0 patch is live. Though a lot of the context was geared towards PvE experience, with the opening of the Black Temple and testing done on the PTR with Hyjall as well.

This patch is noteworthy due to the number of items that have been upgraded both PvE and PvP. For more information on patch notes, you can head over to:

http://worldofwarcraft.com/patchnotes/

All Epic quality items in the game got buffed, as well as fine tuning to dungeon bosses. Look for a big surge in PvE boss kills, as well as bigger crit numbers in the Arena. A couple of hot fixes for several issues has also been released for the patch.

Source: www.worldofwarcraft.com