Yes, you heard me right, Diablo 3 gave us all a sneak peak at the first 3 classes - Barbarian, Witch Doctor and Wizard. Now, be astounded by a not so unique class but nonetheless, somewhat original to Diablo's realm, the Monk:

Diablo 3 Class: Monk

Blizzard also announced a new environment in the upcoming Diablo 3 called Borderlands, check it out here:

Diablo 3 Environment: Borderlands

Of course, I am still eagerly awaiting its release (TBA), hopefully when I'm done with my degree it'll be released by then.