To those who keep saying this is intended... Yes, controlling mobs is intended. Using their abilities is intended. However, Aura of Lost Hope is not an active ability, i.e.: a button the player clicks; it has to be triggered. Pulling a good chunk of an entire instance to your location instead of you running to their locations bypasses the design of a 5-man dungeon, and is not intended.
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This trick works in both Normal and Heroic versions of Ahn'Kahet: The Old Kingdom.
Use a Death Knight to cast Control Undead on a Plague Walker. Keep it alive so it triggers its Aura of Last Hope, at which point a sizable portion of the instance aggroes and runs to your location. There are multiple Plague Walkers towards the beginning in the dungeon, so if it dies before casting the aura just find another one.
Why does this work? The aura has a radius of 99 yards. :)
Take advantage while this lasts, folks.
Source: Ahn'kahet: The Old Kingdom DK Glitch - Forums - World of Warcraft
Video: https://www.youtube.com/watch?v=ng-CqXPgvuE
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Not my discovery. Please, no +rep.