Dungeon Siege III was originally scheduled to release at the end of this month, but Square Enix delayed the co-op RPG to June 21st. Speaking of co-op, they released a new co-op trailer today:
The cooperative play in Dungeon Siege III is inspired by the Lego games. Co-op players can drop in and out at any time, and if they put the controller down, the AI will take over a minute or so later. You can read more about how co-op works here.