As announced, Joomla 4.0 Beta 1 has been released for testing. In preparation for Joomla 4.0 stable, Joomla! 3.10 will primarily be a bridge between Joomla 3.x and Joomla 4.
Joomla 3.9.13 is now available. The Joomla 3.9.13 release contains 2 security vulnerability and over 15 bug fixes and improvements.