Summarizing this thread here: http://us.battle.net/wow/en/forum/topic/7811402422?page=1
Those of you gnomes who have dreams of completing the first three Mists of Pandaria raids while they are still relevant need to get on the ball! When Patch 5.2 hits, the three raids: Mogu’shan Vaults, Heart of Fear, and Terrace of Endless Spring will be hit with nerfs.
Enemy Health and Damage will be reduced by 10% across the board.
Drop rates on gear will be increased (including Elder Charms of Fortune chances!).
Also the costs of 5.0 and 5.1 Valor Gear will be reduced by 50% and 25% respectively.
New Feats of Strength will be earned if you defeat Normal and Heroic mode bosses PRIOR to the nerfs!
So if you covet those Feats of Strength, the time to swing into action is now. Also there will very likely be a VALOR POINT WIPE when 5.2 hits! Dont let that catch you unawares! So if have valor points spend them while the spending is good!