A new version of Joomla is out and it's a bug fix - not a security release.
Joomla 3.4.8 Released (joomla.org on December 24, 2015)
Joomla! 3.4.8 is now available. This is a bug fix release for the 3.x series of Joomla This release fixes some bugs related to session management from Joomla 3.4.7. The project understands that many of our users are now on Christmas Holiday's so we would like to emphasise that this release only contains bug fixes and whilst we strongly encourage our users to update as soon as practically possible, this update can be left until after any holidays.
Joomla 3.4.8 fixes some issues found in the 3.4.7 release on Monday to do with browser sessions. All reported bugs from the 3.4.7 update have been fixed in this release:
Users were unable to edit or create items after the 3.4.7 update
Fatal error about connection->stat() not existing on external database connections
After session timeout users could still navigate the backend but without being able to create/edit items or use pagination/filters
For known issues with the 3.4.8 release, see the Version 3.4.8 FAQ in the documentation site.. Please note that it is expected that you will be logged out as soon as the update is complete.
The previous update to Joomla just happened on December 21, 2015.
Our Website Maintenance Department will be in contact with all of our clients running Joomla regarding these upgrades.