The Lily Hill series does not have a new book coming out soon. The latest book, Leftover Lily (Book 4), was published in July 1999.
The first book in the Lily Hill series, Sweet and Sour Lily, was published in July 1998.
The Lily Hill series primarily falls into the General Fiction genre. This series was written for ages 5-7 and is a good choice for children just learning to read.