Patch 1.9 will make it easier to buy and sell stuff thanks to the arrival of the Linked Auction House System. The Horde auction houses will be located in Orgrimmar, Undercity and Thunder Bluff, while Alliance players will need to head to Ironforge, Stormwind and Darnassus. In addition, the neutral auction houses at Tanarius, Everlook and Booty Bay will be linked so that players of both factions can access them.
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The "Looking for Group" and "Trade" channels have also been linked between cities - so, for example, you can do a bit of trading in Ironforge even though you're in Stormwind.

The patch will put an end to multiple battleground queues, so you can either join the first one that becomes available or hang on for the battleground you really want. Other improvements will include updates to all three Paladin talent trees, and high-level class armour sets are getting a graphical overhaul.