The Guests of War series does not have a new book coming out soon. The latest book, The Lights Go on Again (Book 3), was published in December 1999.
The first book in the Guests of War series, The Sky Is Falling, was published in May 1990.
The Guests of War 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.