Just to emphasize, as someone who as played beta...this "nerf" has been in there for a while now. It just took until this recent build to change it's tooltip.
Divine Plea is not a mana tide, it is not a shadow fiend or an innervate. It is more like an EVOCATE from a mage and a Bloodrage from a warrior smooshed together. It has the 25% generation from the Bloodrage and the inability to do anything from Evocation :\
REMEMBER THIS....IS....BETA, nothing is permanent and can be changed at a moments notice.
But in case you Holy pallies feel bad, i direct you to the Enhancement Shaman nerfs, and the fact that the new hero class can replace them by giving the raid nearly every buff they can. >.> Poor shaman.