The original poster has a point. Considering on how new talents (especially Ancestral Awakening and Improved Water Shield) point towards crit, optimal itemisation would put Int, Sta, Spellpower, MP5 AND Crit on an item - considering that an item that has both MP5 and Crit is easier on the itemisation value than an item with only MP5 (=healing gear, according to the placeholder names) or crit (= Nuker gear).
For those who still don't know - the higher a single value, the more expensive it is on the item budget. So while an item "of Strength" has 50 strength, the same item with the suffix "of the Tiger" has 35 STR and 35 AGI (for a total of 70 stat points instead of 50).
If the itemisation stays this way, you have two choices - either go for Resto with "nuking" gear, focusing on crit instead of MP5 (and probably some haste rating too). And pray that Improved Water Shield will give you enough MP5 to keep on casting (though with the downranking nerf and potential potion sickness, this is far from a sure thing). Advantages are the - rather good - talents that benefit from crit rating. Disadvantages are potential mana problems if Imp. Water Shield (sort of Illumination "light") doesn't cut it.
Or go the traditional route and stack MP5. You might not run into mana problems that way... but you miss out on the more exciting new talents like Ancestral Awakening since you have like 20% crit rating unbuffed (considering buffs like Moonkin Aura going raidwide - otherwise more like 12%).
Personally, I prefer the first option, though it's just a gut feeling... however, the advantage that with crit gear, you can respecc to Elemental if a certain boss requires it sounds rather appealing.