Calling all Dark Knight fans, Warner Bros. Interactive Entertainment and DC Entertainment have release a brand new trailer for Batman: Arkham City featuring the Riddler. Batman: Arkham City is coming out quicker than you could say "Riddle me this." Mark October 18th on your calendar as that is launch day for Batman: Arkham City as it lands onto an Xbox 360, PlayStation 3 and Windows PC near you. Take a look at the latest trailer and be prepared to dive into Gotham City's seedy crime world.