The 100 Dresses series does not have a new book coming out soon. The latest book, The Starlight Slippers (Book 3), was published in July 2018.
The first book in the 100 Dresses series, If the Magic Fits, was published in October 2016.
The 100 Dresses 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.