The Belle series does not have a new book coming out soon. The latest book, Love (and Other Uses for Duct Tape) (Book 2), was published in March 2008.
The first book in the Belle series, Tips on Having a Gay (ex) Boyfriend, was published in May 2007.
The Belle series primarily falls into the Contemporary Romance genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.