Mana Globe

Mana Globes are orbs of magical energy that function much like health globes; they restore mana (25% of the maximum was the listed amount) when a character runs through them. As you might expect, they look just like health globes, but are blue, instead of red.

No mana globes were seen during the Blizzcon demo play, and they are only mentioned in the description of the Mana Recovery spell. It's not known if they ever drop other than when a Wizard is around, with points in that skill. It's assumed that other characters would share in the benefit, as they do with health globes, but this is just conjecture.