Blizzard revealed a new playable hero for Heroes of the Storm during BlizzCon today. Orphea is the first brand new hero to enter the Nexus, and she uses dark magic and will be available with a 'teeny' skin.
"Rejecting the dark power her father had begun to consort with, Orphea tried to run away from the Raven Lord's influence. But after witnessing King's Crest fall to his machinations, she was convinced she needed to stand and fight. She now vows to protect the innocent--as a Hero of the Nexus."
For more information check out Orphea's profile on the Heroes of the Storm website and see her in action in the videos below (in which Janitor Leoric also pops up).