The document outlines the features of Joomla 3.9, including a privacy system, consent checkbox for forms, personal data management, and an action logging system. It mentions that the upgrade from version 3.8 to 3.9 is straightforward and includes enhancements like Google Invisible reCAPTCHA and article content loading capabilities. The stable release of Joomla 3.9 is expected on October 23, 2018.