@RoaringKitty Volume 14 Part 3 was released (for pre-publication readers) on the 10th of January this year. Volume 14 has 16 parts, the last of which was released the Friday before last.
As for volume 15, we generally don't get much advance warning of when a book will begin pre-publication releases. As a matter of policy, JNC staff won't talk about release times until they're ready to be added to the release calendar - which normally happens shortly before the release of the first part of the volume. I can't even give you a rough guess as to when that might happen, much as I wish I could.
