Ubisoft and Nival have released a demo of Heroes of Might & Magic V, which includes three playable missions, two races, and the online duel mode. The download is 685MB and has some hefty recommended requirements. It hasn't exactly been a pleasant ride for series newcomer Nival, so it will be interesting to see if they've turned the corner. Let us know what you think about the game. The expected launch date for Heroes V is May 23.