I've got some good news and some bad news. The good news is that Richard Dawkins is planning to release another book, this one called "The Greatest Show on Earth: The Evidence for Evolution". It's even available for pre-order on Amazon. The bad news is that it won't be out until September 2009 (He says so himself in an interview).
It shouldn't be too hard to wait for the book though, since Jerry Coyne's new book "Why Evolution is True" is set for release today. Expect a review of it in a few weeks.