This is my second spec suggestion for MoP, the first was a new Paladin spec: http://eu.battle.net/wow/en/forum/topic/3061859970?page=1

Earth Wardens will use the power of the earth to shield their allies.
Gear:
Mail Armor, Two Handed Weapon or Duel Wielding weapons.
Primary Stats:
Agility and Stamina
Secondary stats:
Mastery Rating, Haste Rating and Critical Strike Rating
Single Target:
Primal Strike, Lightning Bolt Flame Shock, Earth Shock and Frost shock
AoE:
Chain Lightning and Magma Totem.

Specialization skills:
Level 10: Vengeance(Passive): Each time you take damage, you gain 5% of the damage taken as attack power, up to a maximum of 10% of your health.
Level 10: Mental Awareness(Passive): your Spell power is now equal to 60% of your Agility, your Stamina is increased by 15% and reduce the chance you will be critically hit by 6%. In addition, all your instant spells cost 75% less mana.
Level 10: Rockbiter Weapon: imbues your weapon with fury of the earth, your single target attacks will now instantly restore 5% of your base mana, your spells have 8% hit chance and you cause high amount of threat with all damage you deal.
-Unleash Earth, 10 seconds cooldown: Unleashes the Rockbiter enchantment upon the Shaman's weapon, forcing up to 4 enemies to attack the Shaman for 6 sec.
Level 15:Mocking shock, 4 seconds cooldown, no GCD, 20 yards: attack that forces the enemy to attack you for 4 seconds.
Level 20: Obsidian Armor(Passive): your armor contribution from Mail Armor is increased by 100%, and all spell-damage you take is reduced by 5%.
Level 25: Earth-Vision Totem, 1.5 minute Cooldown: Summon a Totem with 5 health to the feet of the caster that increases the caster's chance to Parry by 50% for 10 seconds.
Level 30: Magma Barrier, 45 seconds CD, 1 sec GCD: You are surrounded by a thin layer of hot magma, reducing damage received by 15%, and inflict XXX damage to any attacker that hit the Earth-Warden. Last 12 seconds.
Level 35: One with the Earth(Passive):Agility now increase Dodge rating even more and Haste Rating now also increases your Parry rating. In addition, Critical Strikes reduce the CD of Magma Barrier by 5 seconds.
Level 40: Diamond-skin Totem, 3 minute CD: Summons a totem with 5 health at the feet of the caster for 20 seconds, reducing all damage done to players within 15 yards by 10%, in addition, any member within 15 yards that gets a killing blow will be healed to 20% but it destroys the totem.
Level 45: Grounded Electricity(Passive): Your Chain Lightning and Lightning Bolt are now instant cast, but there is now a cooldown of 8 seconds.
Level 50: Obsidian Elemental, instant, 5 min CD: You summon an Obsidian Elemental companion at your side, will last until dead or canceled, the Obsidian Elemental will have a set of abilities:
-Master's Aid, 2 minute CD: come to the aid of the Earth-Warden, channeling 50% of its health to his master over 10 seconds, interruptable.
-Burrow, 3 minute CD: Burrow underground for 10 seconds, healing the Obsidian Elemental for 50% of his life.
-Boulder throw, 15 second CD: Throw a boulder at the target, causing XXX damage.
-Pound, 8 second CD: Pound up to 4 targets in front of the Obsidian Elemental.
Level 50: Mail Specialization(Passive): increase your Stamina by 5% while wearing only Mail armor.
Level 55: Ancient Elements, 2 minutes CD: The elements are imbued in the earth-Warden, reducing magic damage taken by 50% and increasing your armor by 50% for 10 seconds.
Level 60: Feral Guardians, 2 minutes Cooldown: Summons two Feral Guardian Wolfs, the guardians will attack the caster's enemies for 30 seconds and heal the Earth-Warden for the amount of damage they do.
Level 80: Mastery - vessel of the Elements(Passive): You are the instrument of the elements, Each time you deal damage with single-target attacks, you gain 25% of the amount of damage dealt as a damage absorption shield that stacks up to 35% of your maximum health. Each point of Mastery increases the shield by an additional 2.5%.
Level 85: Earth Giant, 5 minuets CD: Transform to a mighty Earth Giant, reducing damage taken by 50%, increasing armor by 50%, But your damage, Movement speed and attack speed is reduced by 20% for 15 seconds, in addition, attackers that hit you get a debuff called, Wrath of Therazane.
-Wrath of Therazane , 5 seconds duration: after the duration of Wrath of Therazane ends on the target, the target is hit by a spike which blow it upwards 10 yards and cause XXXX damage.