This appears to address the bugs from 3.2.6. Has anyone upgraded yet? I think I'll wait for feedback before running it given issues with the previous release.
The fixed issues include, among others, issues with form token validation during login, the inability to change topic types after posting, an issue with viewing private message folders, and potentially incorrectly shortened URL links when using the [url=] BBCode.
Full backwards compatibility for styles released before phpBB 3.2.6 has been introduced, which will enable logins even though these styles have not yet been updated with the latest style changes.