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According to player reports, queues are building in World of Warcraft with the arrival of Siege of Orgrimmar that will allow players to take on none other than Garrosh Hellscream himself. The Blizzard team has sent out a list of handy articles to read while you're waiting to get on your server.
There are many features with this patch including:
Siege of Orgrimmar (14 boss raid)
Flexible Raid difficulty
PvP / Arena updates
Conclusion to the Legendary questline
The Celestial Tournament - new Pet Battle tournament
Class and game balance changes
Read more at the links above.