Stat changes:
* Armor penetration is being removed from gear[2]. However, some physical damage specs may still be able to gain armor penetration through talents and / or mastery bonuses.
* Attack power is being removed from gear. Death knights, paladins and warriors will still gain 2 attack power per point of strength, and all druids, hunters, shamans and rogues will get 2 attack power per point of agility and no attack power from strength.
* Block value is being removed from the game, blocking will provide percentile damage reduction, which can be increased through talent trees and mastery bonuses.
* Defense is being removed from the game, including both defense rating and the defense skill. All tanking specs will get anti-critical hit talents similar to Survival of the Fittest.[3]
* Haste for melee and physical ranged DPS classes will affect the rate at which energy, rage, focus and runes are gained. Enhancement shamans and retribution paladins will gain talents which allow them to gain similar benefits from haste. It will no longer provide weapon speed increase as it once did for these classes[citation needed]. Haste for casters is unchanged.
* Mastery is being added. Mastery will provide a bonus based on the talent tree which has the most points in it, such as armor penetration or cooldown reduction.
* MP5 is being removed, all healing specs will rely on spirit for mana regeneration. Holy paladins and restoration shamans may get mana regeneration talents like Intensity and Meditation, or the 5 second rule may be removed. Spell DPS classes will no longer rely on spirit for mana regeneration, and spirit will no longer be on spell DPS gear.
* Spell power is being removed from items. Characters will gain spell power from intellect much like how they currently gain attack power from agility and strength.