Posted on Dec 20 2013 byin Blog
Feel free free to upgrade at any time.
If you encounter a “bug” issue with a theme, please be sure to check for any plugin compatibility issues because these can cause issues with a site after upgrades. If the problem persists, please use the Support Forum to report it to us.
This latest WordPress release primarily focused on changes to the user interface with minimal changes to the functionality of platform itself. In addition, there were minor bug fixes which usually accompany a version release. For additional details you can check out the Codex for the official summary of Version 3.8.