Innervate Changed to a Flat Number -

As we had been warned previously, Innervate is being changed in patch 3.1.2 to restore a flat amount of mana. At the moment, it restores mana based on the spirit of the target. After the patch, it gives "450% of the casting Druid's base mana pool to the target over 20 seconds," which works out to a bit under 16,000 mana over the course of the effect.

Personally not too bothered about the changed to Innervate, never used to get it because of my lack of spirit as a Holy paladin.

Now it gives 16k-ish mana I might start getting it a bit more, though mana isn't usally that much of a problem for me (though more so now than in Naxx).