The Rotten Apple series does not have a new book coming out soon. The latest book, Zombie Dog (Book 2), was published in August 2012.
The first book in the Rotten Apple series, Mean Ghouls, was published in August 2012.
The Rotten Apple series primarily falls into the Horror genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.