The Great Alta Saga series does not have a new book coming out soon. The latest book, The One-Armed Queen (Book 3), was published in November 1998.
The first book in The Great Alta Saga series, Sister Light, Sister Dark, was published in September 1988.
The Great Alta Saga series primarily falls into the Fantasy genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.