The first World of Warcraft: Cataclysm patch of the year is in development and now available for testing on the Public Test Realms. This minor patch includes several updates that we were unable to apply via hotfixes, including the recently announced cross-realm raids, assorted class balance fixes, and more. If you'd like to help us test out this patch and provide feedback, you can start by copying your character over to a test realm. Once you've had a chance to try things out, be sure to visit our Public Test Realm forum to discuss the patch.
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Notes for all World of Warcraft patches can be found
here