It will come out April 5 2011.
The book that follows "The Sign of the Moon" in the Warriors series is "The Forgotten Warrior." It is the fifth book in the Omen of the Stars arc.
Omen of the Stars Book 5: The Forgotten Warrior comes after Sign of the Moon in the Warriors series.
April 5th, 2011
Sign of the Moon
The books that have come out prior to 2011 are as follows: The Fourth Apprentice Fading Echos and Night Whispers The next book to come out is: Sign of the Moon
Dovepaw and Ivypaw will become warriors in the book "The Last Hope," which is the final book in the Omen of the Stars series in the Warriors series by Erin Hunter.
It will be released April 11,2010.
Warriors - Sign of the Moon is a fictional narrative intended primarily for entertainment. It does not have a clear "message" outside of the story.
The next book in the Warriors series after Night Whispers is Sign of the Moon. It is the fourth book in the fourth series called Omen of the Stars, following the adventures of the warrior cats as they uncover prophecies and face new challenges.
If the book was in the AR, then it would have an AR sticker on the front. I'm pretty sure you can find the level on the AR website. But if Warriors Sign of the Moon isn't an AR book for your school, then I don't know where you can find the level
Once Erin and her publishers are done promoting the newer books - in my guess very soon.
Yes, there are multiple books in the "Warriors: Omen of the Stars" series that continue the story after "Fading Echoes." The books in this series are "Night Whispers," "Sign of the Moon," "The Forgotten Warrior," and "The Last Hope."