There are 2 books in the Harley Quinn (The New 52) series.
The Harley Quinn (The New 52) series does not have a new book coming out soon. The latest book, Harley Quinn Vol. 2: Power Outage (Book 2), was published in April 2015.
The first book in the Harley Quinn (The New 52) series, Harley Quinn Vol. 1: Hot in the City, was published in November 2014.
The Harley Quinn (The New 52) series primarily falls into the Graphic Novel, Science Fiction and Fantasy genres.