It seems that the desire of fans about new single player content for Batman: Arkham City soon will be completely satisfied. The PSN Trophies in fact lists 10 new objectives of the game that they would think, at least for one of them, a Robin as playable protagonist of a new portion of history. The additional content should be called "Harley's Revenge" but for the moment no confirmation is still available. Of course we will keep you updated on this.