The Witch Doctor is a new character reminiscent of the Diablo II necromancer, but with skills more traditionally associated with shamanism and voodoo culture. The witch doctor has the ability to summon monsters, cast curses, harvest souls and hurl poisons and explosives at his enemies. Blizzard has stated that the witch doctor is not another version of the necromancer and that they more incorporate the necromancer in a furture expansion if they so desire. To power spells the witch doctor uses mana, which regenerates slowly.

The Barbarian will have a variety of revamped skills at their disposal based on the use of incredible physical prowess. The barbarian is able to whirlwind through crowds, cleave through swarms, leap across crags, and crush opponents upon landing. The resource used by the barbarian is fury, which is generated through getting attacked by enemies, attacking enemies and through certain abilities. Fury is used for certain strong abilities and degenerates over time.

The Wizard is a version of the sorceress from Diablo II or the sorcerer from Diablo. The Wizard's abilities range from shooting lightning, fire and ice at their enemies to slowing time and teleporting around enemies and through walls. The wizard fuels their spells with arcane power, which is a fast regenerating power source.

The Monk is a  attacker, using  to cripple foes, resist damage, deflect projectiles, attack with blinding speed, and land explosive killing blows. It combines the melee elements of Diablo II's assassin class with the "holy warrior" role of the paladin. Blizzard has stated that the monk is not related in any way to the monk class from the Sierra Entertainment-made Diablo: Hellfire expansion.The monk is fueled by spirit, which has defensive purposes and is slowly generated through attacking, though it does not degenerate.

The Demon Hunter combines elements of Diablo II's amazon and assassin classes. Demon hunters use crossbows as their main weapon and also throw small bombs at enemies. Some of their skills have been revealed and among them are arrow skills such as Chain Arrow. The demon hunter is fueled by discipline and hatred. Hatred is a fast regenerating resource that is used for attacks, while Discipline is a slow regenerating resource used for defensive abilities.

Note: This is information from Wikipedia so you can't rely entirely on it's accuracy.

I have merly gathered the information together to soley focus on the classes.

Are you Getting Diablo III?

If so what class are you looking forward too?

Please comment!