Joomla! 3.4.8 is now available with bug fixes discovered with the previous 3.4.7 release. The Joomla Team official statement says this release is essentially a security release. Though immediate update is recommended, because it is a holiday, the update can be done after the holiday period.

This means that taking some days before implementing an upgrade may not cause any damane.

Joomla 3.4.8 fixes some issues found on Monday to do with browser sessions. All reported bugs from the 3.4.7 update have been fixed in this release. The problems identified with 3.4.7 were that:

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

We suggest the following steps to update your website:

Make a full backup of your site (database and files).
Verify your backup integrity and make sure to know how to restore it.
Update Joomla to version 3.4.8.
Update all extensions to their latest version.

If you need assistance, contact us and ask for our custom services options.

Source: https://www.todhost.com/announcements/33/Joomla-348-Released.html