Classic vs Forever: every talent and spell change by class · stillsixty

Priest changes

Discipline

Power in LightYour Smite and Penance spells deal 10% increased damage to targets afflicted with your Holy Fire.NewTalent · Discipline
Wand SpecializationColumn 3 to 2; Ranks 5 to 2ChangedTalent · Discipline
Twin DisciplinesIncreases the damage and healing of your instant cast spells by 5%.NewTalent · Discipline
Unbreakable WillIncreases your chance to resist Stun, Fear, and Silence effects by an additional 15%.RemovedTalent · Discipline
Silent ResolveRanks 5 to 3ChangedTalent · Discipline
Holy PrecisionImproves your chance to hit with Holy spells by 18%.NewTalent · Discipline
Improved Power Word: ShieldMax rank ~~15%~~ to 20%ChangedTalent · Discipline
MartyrdomRank 1 ~~10%~~ to 20%ChangedTalent · Discipline
Improved Power Word: FortitudeIncreases the effect of your Power Word: Fortitude and Prayer of Fortitude spells by 30%.RemovedTalent · Discipline
Mental AgilityRow 4 to 3; Ranks 5 to 3ChangedTalent · Discipline
Inner FocusWhen activated, reduces the Mana cost of your next spell by 100% and increases its critical effect chance by 25% if it…ChangedTalent · Discipline
MeditationMax rank ~~15%~~ to 50%; Column 3 to 4ChangedTalent · Discipline
Improved Inner FireIncreases the Armor bonus of your Inner Fire spell by 45% and increases its total charges by 12.ChangedTalent · Discipline
Mental StrengthMax rank ~~10%~~ to 15%; Row 5 to 4ChangedTalent · Discipline
Soul WardingReduces the cooldown on your Power Word: Shield spell by 4 sec and reduces its mana cost by 15%.NewTalent · Discipline
Improved Mana BurnMax rank ~~0.5 sec~~ to 1.0 secChangedTalent · Discipline
PenanceLaunches a volley of holy light at the target, causing 45 Holy damage to an enemy, or 134 healing to an ally, instantly…NewTalent · Discipline
Renewed HopeYour heals from Flash Heal, Binding Heal, Lesser Heal, Heal, Greater Heal, and Penance gain 10% increased critical…NewTalent · Discipline
Divine SpiritNow trained at level 30, no talent pointRemovedTalent · Discipline
Divine AegisYour critical heals create a protective shield on the target, absorbing 15% of the amount healed. Lasts 12 sec.NewTalent · Discipline
Force of WillIncreases your spell damage by 5% and the critical strike chance of your offensive spells by 5%.RemovedTalent · Discipline
Power InfusionNeeds PenanceChangedTalent · Discipline
Confounding FlashConfuses up to 5 enemies within 8 yds for 3 sec. Any damage taken will break the effect.NewSpell · Discipline
Contingency PlanPlace a Holy ward on an ally for 30 sec. The next time this ally takes damage dropping their Health below 35%, they will…NewSpell · Discipline
Divine SpiritNo talent point neededNo longer a talentSpell · Discipline
Power Word: FortitudeMax rank 54 to 70ChangedSpell · Discipline
Power Word: ShieldMax rank ~~942 damage~~ to 928 damageChangedSpell · Discipline
StarshardsMax rank ~~936~~ to 1800; Cooldown ~~none~~ to 30 secChangedSpell · Discipline
Elune's Grace~~10%~~ to 50%; Cost ~~60 Mana~~ to 3% of base manaChangedSpell · Discipline
FeedbackCost ~~580 Mana~~ to 230 ManaChangedSpell · Discipline
Feedback
Spell · DisciplineChanged
Classic
FeedbackRank 5/5
~~580 Mana~~
Instant3 min cooldown
The priest becomes surrounded with anti-magic energy. Any successful spell cast against the priest will burn 105 of the attacker's Mana, causing 1 Shadow damage for each point of Mana burned. Lasts 15 sec.
Forever
FeedbackRank 5/5
230 Mana
Instant3 min cooldown
The priest becomes surrounded with anti-magic energy. Any successful spell cast against the priest will burn 105 of the attacker's Mana, causing 1 Shadow damage for each point of Mana burned. Lasts 15 sec.
Mana BurnMax rank ~~789~~ to 788ChangedSpell · Discipline
LevitateAllows the caster to levitate, floating a few feet above the ground. While levitating, you will fall at a reduced speed…ChangedSpell · Discipline
Prayer of FortitudeMax rank 54 to 70ChangedSpell · Discipline
Prayer of SpiritPower infuses all party and raid members, increasing their Spirit by 40 for 1 hr.ChangedSpell · Discipline

Holy

Shadow Magic

What changed during the beta, update by update, is in the patch notes. To try a build, use the talent calculator.