The Nnewts series does not have a new book coming out soon. The latest book, The Battle for Amphibopolis (Book 3), was published in July 2017.
The first book in the Nnewts series, Escape from the Lizzarks, was published in January 2015.
The Nnewts series primarily falls into the Action Adventure genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.