There are 6 books in the Avatar: The Earth Kingdom Chronicles series.
The Avatar: The Earth Kingdom Chronicles series does not have a new book coming out soon. The latest book, The Tale of Katara (Book 6), was published in April 2008.
The first book in the Avatar: The Earth Kingdom Chronicles series, The Tale of Aang, was published in May 2007.
The Avatar: The Earth Kingdom Chronicles series primarily falls into the Action Adventure genre. This chapter book series was written for ages 7-10, but some older readers may still like to read these books.