It really ****s a lot of things up on it. I'm just glad I don't have to figure out what I'm going to respec to. They moved a lot of things that were on lower tiers to much much higher. Honestly I think in many ways it's going to reduce how much lower level Priests heal, or those without epics, and mostly benefit those running Onyxia and higher.
It seems like they really nerfed some areas, and greatly improved others. I do like how Holy Nova isn't a ****ing Tier 7 spell anymore. It's honestly hardly even a Tier 3. I think at max rank it does like 400 dmg/healing.