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.
About the Author (Author Profile)
Mike Durkin is CEO of Solostream. He is passionate about the power of publishing for everyone on the Internet. Prior to Solostream, he spent over 12 years working and consulting with various Internet and technology start-ups, with a focus on sales, marketing, and operations.