I don't know if this has been posted, but someone posted this in another forum for the current Limit Breaks description after some data mining.
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http://i.imgur.com/6ivacs0.jpeg
Tank:
LV 1. Shield Wall: Reduce damage taken by all party members by 10%: Duration 10s
LV 2. Mighty Guard: Reduce damage taken by all party members by 20%: Duration 15s
LV 3. Last Bastion: Reduce damage taken by all party members by 50%: Duration 12s
Attacker:
LV 1. Braver: Delivers an attack with potency 2300
LV 2. Bladedance: Delivers an attack with potency 5000
LV 3. Final Heaven: Delivers an attack with potency 9000
Caster:
LV 1. Skyshard: Deals Elementally neutral damage with a potency of 1400 to all enemies near point of impact.
LV 2. Starstorm: Deals Elementally neutral damage with a potency of 3000 to all enemies near point of impact.
LV 3. Meteor: Deals Elementally neutral damage with a potency of 5400 to all enemies near point of impact.
Healer:
LV 1. Healing Wind: Restores 25% of own HP and the HP of all nearby party members.
LV 2. Breath of the Earth: Restores 50% of own HP and the HP of all nearby party members.
LV 3. Pulse of Life: Restores 100% of own HP and the HP of all nearby party members, including one KO'ed.
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So far I've only seen up to 2 Bars (Lvl 2) of Limit Break in-game. Also seen Braver and Starstorm.