When adding an alias to a domain with a Let’s Encrypt SSL certificate, the cert is automatically updated to include the alias domain.
Backups from cPanel, Plesk and other control panels can now be migrated even when Nginx is used as a webserver.
Many Install Script updates
Conversion of WordPress to use WP-CLI when available for many operations
Minor Dropbox backups support bug fixes
Support per-domain SSL certificates in most services not previously covered (when domain has a dedicated IP address)
Numerous other bugfixes and minor enhancements
Updates for OwnCloud, Node.js, SuiteCRM, IonCube, Joomla, Mantis, Piwik, LimeSurvey, Drupal, and MediaWiki
Fixes for some forms under the new theme version (most importantly Website Options)
Minor bugfixes in migrations, backups and validation
Remove PHP4 support (this seems more than minor, and is actually a pretty big bunch of code changed/removed, but no one should be running PHP4 at this point, as it has been end-of-lifed by the PHP folks for years and is not supported on any distribution we currently support).