The Clockwork Dark series does not have a new book coming out soon. The latest book, The White City (Book 3), was published in September 2011.
The first book in The Clockwork Dark series, The Nine Pound Hammer, was published in September 2009.
The Clockwork Dark series primarily falls into the Fantasy genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.