Joomla 4.0 Alpha 1 Released for Testing
Reworked installer for a quicker and more intuitive user experience
New templates using Bootstrap 4
Reworked Application for Consoles
Integration of Joomla Framework packages
There is one goal for this release: to allow advance testing of custom extensions so that extension developers can report any problems well before the final release.
For a complete list of known backward compatibility issues for version 4.0, please see Potential backward compatibility issues in Joomla 4.0 in the documentation site.
For the full known issues with the 4.0 alpha-1 release, please see the version 4.0 Alpha-1 FAQ in the documentation site.