By Polar Feb 6, 2013
Patch 5.2 will bring a nerf to current MoP raid content but we are still expected to run it before entering the new Throne of Thunder:

On Normal and Heroic mode, zone-wide auras have been activated in Mogu’shan Vaults, Heart of Fear, and Terrace of Endless Spring, reducing the health and damage of all enemies therein by 10%. A NPC near the entrance within each zone explains this, and offers to deactivate the buff for the benefit of brave/foolhardy adventurers.

Check out WoW Insider for more info
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