Square Enix has announced that the demo for their upcoming action-RPG, Dungeon Siege III, is now out on the Xbox 360 platform. The demo will be available to both Windows PC and PlayStation 3 gamers come June 7th, 2011. Dungeon Siege III will feature co-op multiplayer as well as customizable character classes as they rebuild the once-great “10th Legion” in an attempt to thwart the evil forces that have besieged the Kingdom of Ehb.