Age of Conan official site has post a preview revealed details on the Mage Archetype and classes that will be available in game.Herald of Xotli, Demonologist, Nacromancer and Lich.

The mage class is based around inflicting damage from range. In their cloth armor, they are unable to withstand much direct conflict. Given the demonic sources from which some of the mages draw their power, the mage classes in Age of Conan will be able to call on dark powers to help them on occasion even when the enemy gets closer! Through the use of spellweaving, mages will be able to create some staggering attacks.

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Herald of Xotli
Some demonologists are either too weak minded or venture too far down the path of demonology to remain untainted. The Heralds are those that bargained with the demon god Xotli and paid the ultimate price, becoming a host to true demonic powers. In battle, the Herald transforms into a demon, preferring to melee opponents and feel the enemy‘s flesh tear rather than rely on spells, although they retain a fearsome arsenal of spells to call upon as needed.

Specialties: melee mage, two handed edged weapons, summon weapons, demon form

Demonologist
The Demonologist bargains with demons for power, binding them to his will. While able to use certain magic without the aid of demonic powers, the Demonologist is not as studied as other mages, having a need to make blood pacts to reach full potential. Still, the Demonologist is powerful enough to bring demons to this realm and bind them to service.

Specialties: fire or electrical Direct Damage, demon pet, short duration buff to increase casting abilities

Necromancer
The master of unholy magic, the Necromancer animates the dead and corrupts the living. Looking down on the Demonologist for needing to strike bargains for power, the Necromancer needs no such crutch, relying on his own master of death of kill his enemies.

Specialties: Cold or Unholy Direct Damage, undead pets, lifetap

Lich
Where the Necromancer animates the dead, the Lich embraces and joins the dead, if only for a period of time. By fusing with the bones of the dead, the Lich gains impressive physical strength and resilience. In this form the Lich prefers to wade into battle and club enemies to death, although retains access to their full array of spells.

Specialties: melee mage, two handed blunt weapons, summon weapons, undead form