Пока известно не все, но тем неменее главным нововведением апдейта буит усиление/нерф классовых мификов, более подробно:

Wrath of Nature ( Fury )
Now gives out damage and heal amount bonuses
Mythical now improves healing and damage spells based upon a percentage of your wisdom and intelligence respectively. This has replaced the Savage Feast effect.

The Impact of the Sacrosanct ( Templar )
The proc effect should now last slightly longer
Added a bonus to reactives based on the templar’s wisdom

Cudgel of Obviation ( Mystic )
The mythical version’s Spirit Tap will only trigger by the mystic’s group members. Also the heal and power bonuses have been reduced.

Dream Scorcher( Defiler )
This now gives heal crit instead of spell crit.
Now grants bonuses to both spells and heals.
Proc should no longer drop when damage is taken

Penitent’s Absolution( Inquisitor )
Improved the Aftershock heal amount and also added a bonus to casting time and reuse time of heals
Penitent Protection will now allow 25% of the damage to go to the intended target. 20% of the incoming damage will then be split amongst fighters in the group. This should make this spell less of a tank killer but the caster must still pay careful attention to their tank.

Dragon’s Temper ( Berserker )
Mythical now grants improved hate gain
Changed the double attack bonus to melee critical chance.

The Truth of Marr ( Paladin )
The delay is now 6 seconds.
Added a damage proc to the weapon.
Should now give both spell and combat art damage bonuses

Sedition ( Shadowknight )
The delay is now 6 seconds.
Added a damage proc to the weapon.
Should now give both spell and combat art damage bonuses

Death’s Grip ( Warlock )
The dumbfire pet bonus has changed to improve the warlock’s critical damage by 10%.

Eye of the Siren ( Coercer )
Now gives a subjugation bonus
The mythical now removes the concentration cost of Possess Essence

Mirage Star ( Illusionist )
Now gives a subjugation bonus

Havoc, Blade of Treachery ( Brigand )
Instead of giving haste to the brigand the proc will now lower their casting time

Gorynn’s Fist ( Bruiser )
The proc will now give the bruiser an additional chance to critical melee attacks

Revitalized Vel`Arek ( Guardian )
The mythical proc will now only do 5% damage reduction.

Ну собсно все как и должно быть нерфят имба мифики типа стражевских значительно усиляют ущербные мифики типа фурькиного, оскверовского и инквизиторовского, ну и прочие весьма логичные изменения типа замены +дабл атаки в зерковском мифике на + крит, добавление крита в мифик брусков ну и т. п.