What I'd love to see is a game based more on Card's shadow series. The later books where bean and the other genius of the battle academy attempt to take over the world. I think it could be done as an RTS style game where you would take the role of a battle academy student leading his nation army in battle against other nations and then you could have a large conquer the world map kinda like romance of the three kingdom between battle were you do diplomacy and strategic deployments of your troops. Card has said in interview before that the romance of the three kingdoms was one of his favorite games of all time.