Priests received many class changes in the first Patch 10.0.5. Check them out!

Priest

Petrifying Scream (new talent) – Psychic Scream causes enemies to tremble in place instead of fleeing in fear.

Discipline

Divine Star – Throw a Divine Star forward 24 27 yds, healing allies in its path for [ 70% of Spell Power ] and dealing [ 56% of Spell Power ] Holy damage to enemies. After reaching its destination, the Divine Star returns to you, healing allies and damaging enemies in its path again. Healing reduced beyond 6 targets.

Power Infusion – Infuses the target with power for 20 sec, increasing haste by [ 25 + 25% of Spell Power ]%. Can only be cast on players.

Mind Blast – Now costs 1.6% of Base Mana (was 2.5%).

Power of the Dark Side – Shadow Word: Pain and Purge the Wicked have a chance to empower your next Penance with Shadow, increasing its effectiveness by 30% 50%.

Power Word: Solace – Strikes an enemy with heavenly power, dealing [ 80% 68% of Spell Power ] Holy damage and restoring 1% of your maximum mana.

Shadow Covenant – Make a shadowy pact, healing the target and 4 other injured allies within 30 yds for [ 165% of Spell Power ]. For 7 sec, your Shadow spells deal 25% increased damage and healing, and Halo, Divine Star, and Penance are converted to Shadow spells.

Pain Transformation – Pain Suppression also heals your target for 12% 25% of their maximum health and applies Atonement.

Protector of the Frail – Pain Suppression gains an additional charge. Power Word: Shield reduces the cooldown of Pain Suppression by 3 sec.

Light’s Wrath now costs 2% of Base Mana.

Painful Punishment – Each Penance bolt extends the duration of Shadow Word: Pain and Purge the Wicked on enemies hit by 0.7 1.5 sec.

Embrace Shadow – Shadow Covenant lasts an additional 4 8 sec.

Twilight Corruption has been reworked. Shadow Covenant increases Shadow spell damage and healing by an additional 10%.

Dark Reprimand can be cast on players.

Stolen Psyche has been renamed to Abyssal Reverie and reworked. Atonement heals for 10% more when activated by Shadow spells.

Blaze of Light now also increases the damage of Power Word: Solace in addition to Penance and Smite.

Weal and Woe increases the damage of Power Word: Solace in addition to Smite.

Wrath Unleashed increases the damage of Power Word: Solace in addition to Smite.

Harsh Discipline has been reworked. Every 10 casts of Smite, your next Penance is free and fires an additional 3 bolts. Your next Penance fires an additional 3 bolts and costs no Mana after 10 casts of Smite, Power Word: Solace, or Mind Blast.

Void Summoner can now trigger from Power Word: Solace in addition to Mind Blast, Penance, and Smite.

Holy

Divine Star – Throw a Divine Star forward 24 27 yds, healing allies in its path for [ 70% of Spell Power ] and dealing [ 56% of Spell Power ] Holy damage to enemies. After reaching its destination, the Divine Star returns to you, healing allies and damaging enemies in its path again. Healing reduced beyond 6 targets.

Burning Vehemence and Searing Light swapped positions in the talent tree. 

Searing Light is a 1-point talent. The damage increase is unchanged.

Burning Vehemence is now a 2-point talent and has been redesigned. Increases the damage of Holy Fire by 25% 15%. Holy Fire deals 25% of its initial damage to all nearby enemies within 12 yards of your target. Damage reduced beyond 5 targets.

Prayers of the Virtuous increases the maximum stack count of Prayer of Mending by 2 per point.

Shadow

Shadow Priest (Spec Aura) 

Increases periodic damage/healing by 10% 21%: Shadow Word: Pain

Increases damage/healing by 10% 21%: Shadow Word: Pain

Increases damage/healing by 10% 32%: Mind Blast

Increases damage/healing by 10% 25%: Shadow Word: Death

Decreases damage/healing by 12%: Shadow Word: Death

Mind Flay – Assaults the target’s mind with Shadow energy, causing [ 141.24% 169.49% of Spell Power ] Shadow damage over 4.5 sec and slowing their movement speed by 50%.

Void Bolt –  Sends a bolt of pure void energy at the enemy, causing [ 198% 237.6% of Spell Power ] Shadow damage.

Shadowy Apparitions – When your Shadow Word: Pain damage over time critically strikes, you also create a shadowy version of yourself that floats towards the target and deals [ 18.7% 20.57% of Spell Power ] Shadow damage.

Devouring Plague – Afflicts the target with a disease that instantly causes [ 70.12% 77.13% of Spell Power ] Shadow damage plus an additional [ 116.56% 128.22% of Spell Power ] Shadow damage over 6 sec. Heals you for 50% 30% of damage dealt.

Vampiric Touch – A touch of darkness that causes [ 141.37% 155.51% of Spell Power ] Shadow damage over 21 sec, and heals you for 50% 30% of damage dealt. If Vampiric Touch is dispelled, the dispeller flees in Horror for 3 sec.

Divine Star now generates 6 Insanity.

Halo now generates 10 Insanity.

Mindgames generates 10 Insanity.

PvP Talents

Blaze of Light – The damage of your Smite, Power Word: Solace, and Penance is increased by 8%, and Penance increases or decreases your target’s movement speed by 25% for 2 sec.

Void Volley – After casting Void Eruption or Dark Ascension, send a slow-moving bolt of Shadow energy at a random location every 0.5 sec for 3 sec, dealing [ 100% 70% of Spell Power ] Shadow damage to all targets within 8 yds, and causing them to flee in Horror for 3 2 sec.