Yes, we're reinforcing our commitment to the open source community and upgrading our GPL license in an effort to stay compatible with the increasing number of GPLv3 adopters. The GPL v3 license will make it easy and safe for free software developers to use db4o with the most recent license framework from the Free Software Foundation. 

With more than 50% adoption GPLv3 covers new ground for the benefit of free software, with additions such as new provisions that prevent digital rights management (DRM) usage with GPLv3 licensed code, new internationalization terms (making the license more compatible globally), compatibility with the Apache 2.0 license, new terms for termination in the event of license violation and patent protections (among others).

Even though support will continue for the older license version GPLv2, we hope this move will inspire free software projects to go with GPL v3 when using db4o!

(Official announcement available here)