Is that really a surprise? Devs don't take many chances these days so once the find something that works they stick with it. Not that I'm complaining but sometimes it's annoying :\

Can you not play as Robin if you already have Catwoman? For some reason I have Robin and Catwoman but i cant find Robin

Arkham Island

they are defiantly going to make an Arkham 3 because if you look at the steel mill in the room where u see joker "die" at the beginning of the game, if you go back an revisit the room later, on the left side of the room there is a harley quinn costume and if you look on the floor right next to it, there's a pregnancy test that has a plus on it.