The Rosie and Phoebe series does not have a new book coming out soon. The latest book, It's an Aardvark-Eat-Turtle World (Book 2), was published in February 1985.
The first book in the Rosie and Phoebe series, The Divorce Express, was published in October 1982.
The Rosie and Phoebe 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.