Blizzard has released the Black Temple dungeon for testing on the Public Test Server patch 2.1 while it last.  Make sure to download your PTR client.  Assist Blizzard to fine tune the path to Lord Illidan, master of Outland. This is what Eyonix announced early this morning:

Eyonix: “The McWeaksauce Brothers in Shattrath are gearing players up for the newly opened Black Temple on the public test realms. For those interested in testing this 25-player capped raid dungeon, please see the McWeaksauce brothers so that no one can say that you weren’t prepared.”