I can agree with this, but I am doing some more math currently to be sure. My post above was more "Int vs. Mastery/Crit" then "Int vs. Mastery/Crit vs. Spirit". I did not account for regen.From my experience with raid testing on Beta, Spirit is going to be the stat that is stacked, at least for the first 2 tiers. Even with the changes, Shaman have very dicey regen in level 90 raid testing, and I can tell you that straight up, mana longevity is the limiting factor in throughput.
INT has lost a huge amount of value, both because regen is more important at level 90 (and is more important than it even was at the start of T11 - because mana is tighter than that) and because it no longer provides any regen with the fixed mana pools. Basically, INT is the same as the old spell power stat was pre-Cata. In WoTLK, when spell power and INT were seperate stats, paladins and disc priests generally gemmed pure INT and Shaman generally gemmed pure Haste.
Also, the stat allocation for Spirit and other secondary stats is double what it is for INT and primary stats. Therefore, a blue quality gem is 320 Spirit or 160 INT. Given MoP mana regen mechanics, I don't think that INT is worth taking over Spirit at a 1:1 ratio. There is no way in hell it's worth taking over Spirit at a 0.5:1 ratio.
I strongly believe that the stat priority will be Spirit > Mastery/Crit > Intellect > Haste
Therefore, the optimal gemming will probably be:
-Blue Sockets - 320 Spirit
-Red Sockets - 80 INT, 160 Spirit
-Green Sockets - 160 Mastery, 160 Spirit
Or pure Spirit gems, ignoring some socket bonuses. Pandaren will be the best race choice (gives an effective +300 Spirit with the best available Spirit food), and Tailoring/Blacksmithing will be the strongest professions, because both give Spirit over INT options and result in the highest possible Spirit gain.