14 Things We Learned From Gamescom 2017
6. Harley Quinn Will Appear In Batman: The Enemy Within Episode 2

The recently-released first episode of Batman: The Enemy Within heavily hinted that Harley Quinn would be appearing later in the series at some point, and Telltale has now confirmed that, yes, the villain will show up in the very next episode.
Episode two, "The Pact", launches on 26 September and will introduce Harley Quinn into the Telltale Batman universe, inevitably creating plenty of hassle for the Dark Knight, no doubt.
Telltale shed more light on Harley's appearance in a press release, stating, "In keeping with our efforts to create our own unique take on the Batman canon, we’ve worked hard to craft an interpretation of the character that captures her essential qualities while still framing her in a new way. The power dynamic between Harley and ‘John Doe’ should prove especially…intriguing." Get hype.