Players work in teams, which consist of one commander and up to four heroes, who can face off against other players or AI. The commander is responsible for building the base, directing units and positioning defenses. The commander can also call upon "Realm Powers" to turn the tide of battle. Heroes have their own set of powers, but are tasked with assisting the commander's units and capturing resources.
More details should shake out at the Game Developers Conference in two weeks. The game will begin its beta this summer.