They mentioned bringing primary stats closer to secondary stats in the xpac and also making Int have less effect on mana pool. I wonder if this means spirit will be the way to increase mana pool, hard to say. Curious what effect this will have on disc as they have largely been dependent on mana pool for their regen.
What they said was that they want/are considering going to a static mana pool per level(~100k at 85 per Ghostcrawler), meaning your max mana is based on your level and will not increase like it does now from outside factors, i.e. talents, buffs, gear. Also, that they want the additional mana required for the fight to come from regen based mechanics like spirit/mana tide and the such. Intellect, if they do use this system, would be solely to provide Spell Power and any remaining talents/spells/skills that worked off of higher mana due to higher Intellect would be changed to work within the boundaries of this new mechanic.
Example: just random numbers here for demonstration purpose
lvl83 max mana 92K
lvl 84 max mana 96k
lvl 85 max mana 100k
lvl 86 max mana 104k
ETC to Level cap.
This enables all gear levels to have the same amount of Initial mana to work with and allows for gearing through a combination closer to a 50/50 split of Int(SP=bigger heals) and Spr(Regen=more throughput) vs now where all healers basically gear for int and minimal spirit because Int is propped up so much by talents/mechanics/spells. I see this almost as a move toward the Burning Crusade style of healing where gearing for Spell Power and MP5 were both choices(depending on the class).