Diablo 3 - The Ten Commandments

I think the point of this IGN article is to cover the design pillars of Diablo III but it essentially ends up a standard preview:

Diablo III's five strong class line-up is looking incredible, and each is even more unique than before. In previous games, for instance, each class utilised mana for powering various skills and spells. In Diablo III, each class has its own system. The Barbarian, for instance, utilises fury. Fury is generated by dishing out damage and taking damage, but it also ebbs away, so must be used as it accumulates, meaning that you're always looking for your next set of kills. A good player will choose a mix of fury-generating and fury-using abilities so they can make the most of this system.