The D3 Barbarian's skills are very similar to the Barbarian from Diablo II, only much more primal, savage and in a way spiritual.
Unlike their previous incarnations, the Barbarian now uses Fury and Stamina for their skills. These new mechanics are detailed below.
Barbarian had a different colored Mana orb in the interface when compared with the blue orb of the Witch Doctors. The Barbarian's orb was more greenish-blue than a perfect blue color. In BlizzCon, when player's actually got to play the Barbarian, it was found that the Barbarian's mana was in fact, Stamina, the new energy type that leads us to believe that different classes may have different energy sources, but the Witch Doctor and the Wizard both have Mana as their energy source.