This is a list of changes for all classes in Patch 2.3

Druid

• The Restoration talent Intensity will be increased to 10/20/30% mana regeneration.
• Rebirth cooldown will be changed from 30 minutes to 20 minutes.
• Moonkin can cast Remove Curse.
• Tree of Life Form can cast Cure Poison and Abolish Poison.
• Tranquility will receive additional additional benefit from spell damage and healing bonuses.

source

Hunter

• Serpent Sting, Immolation Trap and Explosive Trap will gain additional damage based on ranged attack power
• Wyvern Sting becoming an instant cast
• Arcane Shot will dispel one magic effect in addition to its normal damage
• Trueshot Aura no longer costs mana to cast and will last until cancelled

source

Mage

• Ritual of Refreshment will allow players to pick up their own stacks of food and water
• Damage coefficient reduction removed from Improved Fireball and Improved Frostbolt
• Evocation changed to restore 15% of your total mana every 2 seconds
• Arcane Meditation increased to 10/20/30% mana regeneration
• Ice Barrior gains additional benefit from spell damage bonuses
• Fire Ward and Frost Ward now gain additional benefit from spell damage bonuses
• Detect Magic removed, all players will see their target's beneficial effects at all times

source

Paladin

• Mana cost for Exorcism, Holy Wrath, and Hammer of Wrath lowered
• Vengeance duration increased to 30 seconds
• Improved Seal of Crusader benefits put into base spell, talent benefits replaced with those of Sancitified Crusader
• Sanctified Crusader renamed to Sanctified Seals, which increases chance to critically hit with all spells and melee attacks by 1/2/3% and reduces the chance your Seals will be dispelled by 33/66/100%
• Crusader Strike cooldown reduced to 6 seconds
• Vindication frequency and duration increased and reduces all attributes by 5/10/15%
• Pursuit of Justice is now 3 ranks and increases movement speed by 5/10/15% and reduces the chance to be hit by spells by 1/2/3%.

source

Priest

• Pain Suppression changes to be targetable on others, give 40% damage reduction and 5% threat reduction Meditation to increase to 10/20/30% mana regen
• Power Word: Shield to gain additional benefit from spell damage and healing bonuses
• Prayer of Healing, Circle of Healing and Holy Nova (healing effect) will gain additional benefit from damage and healing bonuses
• Priest Racials- Change to Fear Ward and the Addition of Chastise for Dwarf and Draenei priests
• Priest Racials- Change to Elune's Grace to reduce the chance to be hit by melee and ranged attacks by 20% for 15 seconds
• Reduction in Mana Cost for Power Word: Fortitude, Divine Spirit, Prayer of Fortitude, and Prayer of Spirit

source

Rogue

• Blind is now a physical attackand the reagent requirement removed
• Fleet Footed changed to increase movement speed by 8/15%
• Shadowstep usable at any time, not only while stealthed.
• Threat caused by next Ambush, Garrote or Backstab is reduced by 50% and cooldown increased to 40 seconds
• Dirty Deeds specials cause 20% extra damage against targets that are below 35% health
• Deadly Throw missile speed increased significantly and snare duration increased slightly
• Ruthlessness only affects melee finish moves
• All poisons now last for one hour

source

Shaman

• Shamanistic Rage will reduce all damage taken by 30% for the duration
• Frost Shock no longer subject to diminishing returns
• Two handed weapons trainable (axes/maces) for Shaman and a new talent elemental focus added
• New relics being added for Shaman, Paladins, and Druids
• Lightning Overload, Mana Spring Totem, Water Shield, Elemental Focus, Lightning Bolt, Lightning Overload, Lightning Mastery

source

Warlock

• Change to Ritual of Souls which will significantly reduce the time to cast and complete it
• Healing reduction effects will now affect health drain spells and abilities.
• Banish can no longer be cast on targets tapped by other players or groups

source

Warrior

• All Disarm immunity effects, including the Arms talent Weapon Mastery, will be changed to reduce the duration of Disarm effects.
• Healing reduction effects will now affect health drain spells and abilities.
• Mace Specialization (Arms) now has a reduced chance to occur but will generate 7 rage instead of 6.
• The talent Tactical mastery (Protection) will also provide additional threat for the abilities Mortal Strike and Bloodthirst while in Defensive Stance.
• The talent Devastate (Protection) will combine the effects of Sunder Armor into its effect and it will also be affected by all talents and items that affect Sunder Armor.

source