Note from the publisher in 2010. This information is still current as of April 2012:
We deeply regret to inform you about the fact that the two volumes on Carpet Pythons (Vol. 2) and Corn Snakes (Vol. 3) will not be published within the next few years.
We have cancelled all orders. In case John Berry and Chimaira see a chance to edit and publish the books in future, we will announce the books at a stage when printing has already started."