EDIT: Also it seems the hero weapons got a slight update. Credit to @yonizaf for the info:
REMINDER: ALL FUTURE HERO-CLASS DETAILS ARE SUBJECT TO CHANGE AT ANY TIME. (Retrieved 2017-04-10)
Oracle (Divinion Fields)
Bonus Mana Mastery: Yellow
Bonus Magic to Weapon: Purple
Class Weapon: Staff of Visions (12 Purple) - Give an ally [Magic+1] to a random skil, then give them Barrier and 3-10 Mana.
Perks: Vision of Health - Adds Life / Vision of Power - Adds Magic / Vision of Home - Counts as Centaur
Traits: Centaur Bond / Invigorated / Portent - All Centaurs gain 2 Magic when an enemy casts a spell.
Requires: Arcane Plains
Deathknight (Ghulvania)
Bonus Mana Mastery: Red
Bonus Magic to Weapon: Purple
Class Weapon: Crypt Keeper (13 Purple) - Death Mark an enemy. Deal [Magic+1] true damage to all enemies below them, boosted by enemy Death Marks. [x3]
Perks: Unholy Armor - Adds Armor / Dark Gift - Adds Magic / Risen Knight - Counts as Knight
Traits: Undead Bond / Warded / Death Curse - Death Mark all enemies when I die.
Requires: Arcane Dark
Titan (Stormheim)
Bonus Mana Mastery: Red
Bonus Magic to Weapon: Blue
Class Weapon: Thorodin (14 Blue) - Deal [Magic+5] damage to an enemy, and half of that damage to adjacent enemies, boosted by ally and enemy Giants. [x6]
Perks: Mighty Heart - Adds Life / Titan’s Strength - Adds Attack / Giant Kin - Counts as Giant
Traits: Giant Bond / Big / Giant Lord - All Giants start battle with 50% Mana.
Requires: Arcane Blood