New feature: Coder (http://drupal.org/project/coder) integration support, so you can do code reviews with translation errors as well
API change: potx status reporting API changed
Fixed bugs and got the 5.x and 6.x parser in line:
For more information on this release candidate and about compatible modules, themes and translations, refer to: http://drupal.org/drupal-6.0-rc3
This release candidate fixes a security vulnerability. Those running the previous release candidate are urged to upgrade immediately. For more details, please see the security announcement: