Here's a quote from Brian Jacques's official Redwall site:
"The Sable Quean
Brian Jacques has written another Redwall adventure. It's called The Sable Quean and it will be published by PPI in the USA in
September or October 2009 January 2010.
The spelling of Quean is not a typing error! Quean is an Old English word for a female cat."
Yes, I put a strikethrough because they changed the date. Anyways, I can't wait for the next Redwall book! Yippee!!!!!!!!!