"Healing – We agree that off-spec healers are too competitive with dedicated healers. Specs such as Shadow, Elemental, and Balance are supposed to be able to provide some healing—that’s one of their perks—but they shouldn’t be able to substitute for a dedicated healer. The change we are going to try here is to have PvP Power benefit either your damage or healing depending on spec. We are concerned that healing may be too high even for dedicated healers, especially for Restoration Shaman and Holy Paladins, who are incredibly strong in PvP at the moment. After we tone down some of the burst damage coming from Hunters, Warriors, and Mages, we may try the PvP healing debuff at 30% instead of the current 15%, but that won’t happen until after we’ve resolved the damage issues." Dev Watercooler: Mists of Pandaria PvP
So after there little dmg nerf they want to again nerf healing overall, as if thats gonna fix anything, especially when lots of healing specs/classes are bad atm, such as disc priests. Wheres the thought process behind this, because this is sad if this is the only thing you guys could think of for changing the off-healing classes is by harming every healing class.