The next Joomla generation - Joomla 4 will make an end of Joomla 3x. Since the alpha version has sneaked out, we hope that the stable version would be released soon.
Joomla 4 will introduce new features, raise the minimum supported PHP version to PHP 7, Media Manager rebuilt as well as remove previously deprecated functionality. Joomla 4.0 uses Joomla! Framework 2.0 and new core User Interface based on Bootstrap 4.