The World of Warcraft Client Patch 3.1.2 was released on the 19th this month, and features many changes. You can view the official patch list to see all of the changes. Some include:
Patch Notes said:
- Equipment Manager
- When enabled from the Interface Options menu, this feature will allow players to store sets of equipment, easily swap between saved sets using hotkeys, and pull items directly from backpacks or bank slots (must be at the bank to equip inventory from the bank).