Thanks to the Batman: Arkham Knight listing on Amazon, we have gotten some insight on the Harley Quinn DLC. The product description reads below:
“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.”
So it sounds like Harley is doing good… We will play as her in a prequel story mode as she tries to get Poison Ivy out of Bludhaven. With Harley’s rising popularity in comics and moving into films, this story dlc is a welcome addition to the shrink turned villainess’s portfolio.
On a side note, there is a little vague insight into Scarecrow’s involvement in the story, claiming that “At the mercy of Scarecrow, the fate of the city hangs in the balance as he is joined by a huge roster of other infamous villains.” This description makes it seem that Scarecrow is getting his game stepped up, and that is not a problem.