After over four years of work with over 570 contributors and 1300+ closed issues, Drupal 8.5.0 releases the Migrate system's architecture as fully stable. This means that developers can write migration paths without worrying for stability of the underlying system.
What's new in Drupal 8.5.0?
This new version makes Media module available for all, improves migrations significantly, stabilizes the Content Moderation and Settings Tray modules, serves dynamic pages faster with BigPipe enabled by default, and introduces a new experimental entity layout user interface. The release includes several very important fixes for workflows of content translations and supports running on PHP 7.2.