With Cataclyms the new Chakra states have been introduced. The Priest can choose 1 of 3 chakra states he can enter which will give him a bonus to different heal spells.

The second effect of the chakra states that it will change the effect of Holy Word: Chastise if you got the talent Revelations

Chakra: Heal

The Chakra: Heal state can be entered by casting Chakra followed by a Heal. The state increases the critical of all the heal spells by 10% and every Heal casted refreshes the duration of Renew on the target.

These are the usefull items for your priest which drop in the new 5 man dungeons.

Head

Amulet

New items which you can use on your priest and can be bought with the new Valor Points.

New Priest Set

Wearing more pieces of this set will convey bonuses to your character.

(2) pieces: Increases the critical strike chance of your Heal spell by 5%.
(4) pieces: Each time your Penance spell heals a target with Weakened Soul you gain 540 Spirit for 10 sec, and being in a Chakra state grants you 540 Spirit for the duration of the Chakra.

Mercurial Mantle
Mercurial Robes
Mercurial Legwraps
Mercurial Cowl
Mercurial Handwraps