Batman: Arkham Origins features an expanded Gotham City and introduces an original prequel storyline occurring several years before the events of Batman: Arkham Asylum and Batman: Arkham City.
Prices
CAGBot Analysis
CAGBot says
I think this is worth around $5 but $4.99 isn't far off. If you don't mind waiting, you might be able to pick this up for closer to $4 a year from now.