Release Candidate 2 for Geeklog 1.3.8 is now available for download. It has a couple of fixes over 1.3.8rc1, most notably more restrictive checks for proper topic access. See the Changelog for a complete list of changes.
There were no database changes over 1.3.8rc1, so rc1 sites can be upgraded by replacing the files (there is no upgrade archive available, but the file docs/changed-files has a list of all the files that changed since 1.3.8rc1).
The tarball also includes updated language files for Italian, Japanese, Polish, Spanish, and Swedish as well as a new language file for "formal" German.