The Roman Brit series does not have a new book coming out soon. The latest book, Boar Wars (Book 4), was published in May 2015.
The first book in the Roman Brit series, Grizzly Gladiator, was published in April 2015.
The Roman Brit series primarily falls into the Historical genre. This chapter book series was written for ages 7-10, but some older readers may still like to read these books.