This page contains a list of high-level topics that were not covered in the 1st edition, because these topics make use of NetBeans APIs that were not "stable" (i.e., officially supported) at the time that the 1st edition was written. (Or because they were not considered the most important/complex topics.) Hopefully, by the time the 2nd edition is released, these APIs will be stable, and/or we will be able to allocate time to them, and we will be able to dedicate chapters of the book to them:
There is currently no plan to provide a 2nd edition, hence there is no date for its release. However, IF it will be produced, it will be released not before May 2008.