4. Batman
Rocksteady delivered one of the games of the decade in Batman: Arkham Asylum. Finally, Batman was captured perfectly with an epic story and superb combat system. They then did the impossible and followed it up with the even better Arkham City. But we're not happy there, we want Gotham in it's entirety. It would seem that the foundation has already been laid. Earlier this year, a gamer found a way out of the map in Arkham City. He could glide outside the boundary line of Arkham City and enter a pre-rendered Gotham which was quite recognisable by various landmarks. Rocksteady reacted by immediately patching it which only added fuel to the fire. An open world Gotham is an obvious step for Rocksteady to take. If rumours of a Superman or JLA game are to be believed, the next gen consoles will be a perfect opportunity for Rocksteady to complete the trilogy.