As a shaman raider my biggest question is the mastery of spirit to mp5 conversion. I stack a decent amount of mp5 as it is (352mp5 casting with only water shield buff) and since all mp5 gets turned into twice the amount of spirit I should stay the same...unless to get that full 50% conversion you need more mastery rating it won't be as much.
I understand there will be plenty of other ways to get mana back, Telluric Currents namely, with Focused Insight another way to save mana every now and then, but at this point I'm on worried about what my gear turns in to come next patch. From what I can gather I will maintain the same amount of haste, probably lose crit, not sure about spell power. Mana pool is also up by a good 5k.