What is this release for?

There are two main goals for Alpha releases:

• Providing developers with the basis to test their extensions and reporting any issues well before the final release
• Allowing users to discover the new features introduced to Joomla 4.

This release includes most of the Joomla Core library changes that will be included with version 4.0.0. Some of these changes will require small changes to extensions. 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.