If you preorder Batman: Arkham Knight on amazon you get the exclusive Pre-Order-DLC with Harley Quinn. Amazon now shows what this DLC will include.

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!!!SPOILER WARNING!!!

“For the first time in the Arkham series take on the role of Joker’s psychotic side-kick Harley Quinn and wreak havoc inside the Blüdhaven Police Department. With this exclusive Story Pack experience events in the lead-up to Arkham Knight as you infiltrate Blüdhaven to rescue your partner in crime: Poison Ivy. Delve deep into Harley’s demented nature and utilize her devastating baseball bat to smash, crash and bash your way to a friend very much in need.” You also get new weapons, Gadgets, Skills and four exclusive Challenge-Maps.

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Batman: Arkham Knight has been delayed until June 2nd. You will be able to get the game for the PlayStation 4, Xbox One and the PC.