The Astrotwins series does not have a new book coming out soon. The latest book, Astrotwins -- Project Rescue (Book 2), was published in March 2016.
The first book in the Astrotwins series, Astrotwins -- Project Blastoff, was published in March 2015.
The Astrotwins series primarily falls into the Action Adventure and Science Fiction genres. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.