Not that this is much of a surprise thanks to the leaks, but GameStop has revealed the bonuses you'll get for pre-ordering Batman: Arkham Knight.
Basically, by just pre-ordering the game you'll receive two additional DLC packs for free: The Harley Quinn Story Pack, which lets you play as Joker's psychotic girlfriend, and the Red Hood Story Pack, which sees you play as the ruthless vigilante Red Hood which I know absolutely nothing about since I don't read comics.
I'm assuming both pieces of DLC will eventually be made available for purchase should you choose not to take GameStop up on this pre-order offer. Batman: Arkham Knight is due out in 2015 with rumors of a February release floating around.
We had a chance to see Batman: Arkham Knight at E3 last month, with writer Lance Liebl going hands on with the new Batmobile. He claims "it's the best thing to happen to Batman since Christopher Nolan." Bold words.