The Marigold series does not have a new book coming out soon. The latest book, Thrice Upon a Marigold (Book 3), was published in April 2013.
The first book in the Marigold series, Once Upon a Marigold, was published in June 2004.
The Marigold series primarily falls into the Fantasy genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.