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
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

Shadow FocusMax rank ~~10%~~ to 5%; Row 2 to 1ChangedTalent · Shadow Magic
BlackoutColumn 3 to 2MovedTalent · Shadow Magic
Spirit TapColumn 2 to 3ChangedTalent · Shadow Magic
Spirit Tap
Talent · Shadow MagicChangedOpen in the talent calculator
- Column 2 → 3
Classic
Spirit TapRank 5/5
Gives you a 100% chance to ~~gain a 100% bonus to your Spirit~~ after killing a target ~~that yields experience~~. For the duration, ~~your Mana will regenerate at a 50% rate~~ while casting. ~~Lasts 15 sec.~~
Forever
Spirit TapRank 5/5
Gives you a 100% chance to increase your Spirit by 100% for 15 sec after killing a non-trivial target or when an enemy afflicted by your Vampiric Embrace dies. For the duration, 50% of your Mana regeneration will continue while casting.
During the beta
- October 1 update · Change
Shadow AffinityMax rank ~~25%~~ to 30%ChangedTalent · Shadow Magic
Improved Shadow Word: PainColumn 2 to 3MovedTalent · Shadow Magic
Shadow ReachRow 4 to 2; Ranks 3 to 2ChangedTalent · Shadow Magic
Improved Mind BlastColumn 2 to 1MovedTalent · Shadow Magic
Improved Psychic ScreamColumn 1 to 2; Now needs BlackoutChangedTalent · Shadow Magic
Mind Flay75 to 63ChangedTalent · Shadow Magic
Improved Mind FlayYour Mind Flay now deals 20% more damage, gains 10 yards increased range, but slows the target's movement speed by 20%.NewTalent · Shadow Magic
Improved FadeColumn 2 to 1MovedTalent · Shadow Magic
Vampiric EmbraceRow 5 to 4ChangedTalent · Shadow Magic
Shadow WeavingColumn 4 to 3; Ranks 5 to 3ChangedTalent · Shadow Magic
SilenceNo longer needs Improved Psychic ScreamChangedTalent · Shadow Magic
Devouring ContagionReduces the mana cost of your Devouring Plague by 50%. Targets that die while Devouring Plague is active spreads it,…NewTalent · Shadow Magic
Improved Vampiric EmbraceIncreases the percentage healed by Vampiric Embrace by an additional 10%.RemovedTalent · Shadow Magic
Early DemiseIncreases Shadow Word: Death's critical strike chance on targets at or below 20% health by 30%.NewTalent · Shadow Magic
DarknessIncreases your Shadow damage done by 10%.ChangedTalent · Shadow Magic
ShadowformAssume Shadowform, increasing your Shadow damage by 10%, reducing the Mana cost of all Shadow spells by 50%, increasing…ChangedTalent · Shadow Magic
Dark SacrificeCannibalize 1600 of your own Health over 15 sec to gain 1920 Mana.NewSpell · Shadow Magic
Shadow Word: DeathA word of dark binding that inflicts 444 to 472 Shadow damage to the target. If your target is not killed by Shadow…NewSpell · Shadow Magic
Devouring PlagueMax rank ~~904~~ to 848; Cooldown ~~3 min~~ to 1 min; Open to every raceAll racesSpell · Shadow Magic
Shadow Word: PainMax rank ~~852~~ to 762ChangedSpell · Shadow Magic
Hex of WeaknessMax rank 20 to 204ChangedSpell · Shadow Magic
Mind BlastMax rank ~~508 to 537~~ to 477 to 503ChangedSpell · Shadow Magic
Touch of WeaknessMax rank 64 to 56; 20 to 204ChangedSpell · Shadow Magic
ShadowguardMax rank ~~116~~ to 96ChangedSpell · Shadow Magic
Prayer of Shadow ProtectionPower infuses all party and raid members, increasing their Shadow resistance by 60 for 20 min.ChangedSpell · Shadow Magic

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