Rather than to show every single spell graphic change, I narrowed down all the available Priest talents. Some of them are still unavailable, but I managed to get 14 talents from level 1-75 on video to show you what these look like in action.

15 Void Tendrils: Sumons Shadowy tendrils out of the ground, rooting all targets within 8 yards for 20 sec. Killing the tendril will cancel the effect. Instant cast. 30 sec cooldown. 4,000 Mana. Psyfiend: Summons a Psyfiend that stands in place for 10 sec. The Psyfiend casts a Psychic Terror on a nearby enemy within 20 yards every 1.5 sec, preferring anything attacking the Priest. — Psychic Terror causes enemies to flee for 30 sec. Damage caused may interrupt the effect. Instant cast. 45 sec cooldown. 25 yd range. 4,000 Mana. Dominate Mind: Controls a mind up to level 88 for 30 sec. Does not work versus Mechanical beings. 1.29 sec cast. 30 sec cooldown. 30 yd range. 2,000 Mana.
30 Body and Soul: When you cast Power Word: Shield or Leap of Faith, you increase the target’s movement speed by 60% for 3 sec. Path of the Devout: Increases your movement speed while Levitating and for 30 sec afterward by 25%. Phantasm: When you Fade, you remove all movement impairing effects from yourself, you become untargetable by ranged attacks, and your movement speed is unhindered for 3 sec.
45

From Darkness, Comes Light:

Surge of Light: You have a $% chance when you Smite, Heal, Flash Heal, Binding Heal or Greater Heal to cause your next Flash Heal to be instant cast and have no mana cost.

Surge of Darkness: You have a 20% chance when you deal damage with Vampiric Touch to cause your next Mind Spike to be instant and not extinguish your Shadow damage-over-time effects from the target.

Coming Soon (Unavailable)

Archangel

Archangel (Evangelism): Consumes your Evangelism, increasing your healing done by 5% for each Evangelism consumed for 18 sec. 30 sec cooldown. Instant.

Dark Archangel (Dark Evangelism): Increases the damage done by your Mind Flay, Mind Spike, Mind Blast and Shadow Word: Death by 25% for 18 sec. 90 sec cooldown. Instant.

60 Desperate Prayer: Instantly heals the caster for 30% of their total health. 2 min cooldown. Instant. Void Shift: You swap health percentage with the current friendly target, and then heal the lower health target by 25%. 3 min cooldown. Instant. 40 yd range. Angelic Bulwark: Anytime a damaging attack brings you below 30% health, you gain an absorption shield equal to 20% of your total health lasting for until cancelled.
This effect cannot occur more than once every 90 sec.
75 Twist of Fate: Increases damage and healing done to targets at or below 20% health by 15%. Power Infusion: Infuses the target with power, increasing spell casting speed by 20% and reducing the mana cost of all spells by 20%. Last 15 sec. 2 min cooldown. Instant cast. 40 yd range. 5,100 Mana.

Divine Insight:

Serendipity: When you heal with Binding Heal or Flash Heal, the cast time of your Greater Heal or Prayer of Healing spell is reduced by 20% and mana cost reduced by 10%. Stacks up to 2 times. Lasts 20 sec.

Shadow of Death: When your Mind Blast deals damage, there is a 40% chance your next Shadow Word: Death will treat the target as if it were below 20% health.

90

Vow of Unity:

You create a Vow of Unity with a friendly target for 15 sec.

Whenever one of you receives healing, the other is healed for the same amount.

Whenever one of you takes damage, x% of the damage is redirected to the other over 6 sec.

Vow of Unity cannot be cast on Tank specialized players. 40 yd range. Instant. 2 min cooldown.

Divine Star:

Fires a Divine Star in front of you, traveling 20 yards doing damage to all enemies and healing all friendly targets in its path.

After reaching its destination, it will return to you also dealing damage and healing all targets in its path. 50 yd range. 0.215 sec cast.

Coming Soon (Unavailable)

Priest Talents in Action (Video)