The hotkey for full screen mode is now Cmd+Shift+F or Ctrl+Shift+F in Windows.

Optimized many JavaScript libraries used in the back-end to reduce memory leaks.

Protected files can now be downloaded by administrators using the fileupload form widget.

The {% content %} tag now supports passing parameters, parsed by a basic template engine (see Cms > Content block docs).

Added Media Manager feature.

Adds experimental command october:mirror for generating symbolic links in a public directory.

Various performance improvements.

Installing plugins has a new interface and themes can now be installed using the back-end.

Default context of manage and pivot forms is now create and update respectively, instead of the old value relation. Use the context option to set it back to the old value (see Backend > Relations docs).

Belongs-to-many model relations now support defining a custom pivot model with the pivotModel option (see Database > Model docs).

The config definitions for behavior RelationController have been refactored. When using pivot mode all columns and fields should now reside in a pivot[] array (see Backend > Relations docs).

Record Finder form widget now supports nested attributes for relations.