Sierra Online will be release Arkadian Warriors "soon" on Xbox Live Arcade. The game features an online co-op mode, and has been scheduled for a release this year.
Press release: Gamers can play as one of three heroic shape-shifting warriors embarking on a trek of epic proportions to release the Land of Arkadia from the evil Gorgon's stony gaze. An original title on Xbox LIVE Arcade, "Arkadian Warriors" features treacherous dungeons where cooperative hack-and-slash role-playing action enhances a deep single-player storyline. The game includes a robust LIVE-enabled cooperative multiplayer mode for two players online or on the same console.