The Stardoll series does not have a new book coming out soon. The latest book, The Secret of the Star Jewel (Book 2), was published in February 2014.
The first book in the Stardoll series, Stardoll, was published in September 2013.
The Stardoll series primarily falls into the General Fiction genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.