Platforms can opt-in for bleeding edge updates by enabling a config setting (cms.edgeUpdates), this helps perform testing before a stable version is deployed.

Relation Controller now supports has one and belongs to relations (see Backend > Relations docs).

The Settings page is no longer governed by a global permission, each settings entry should have its own permission definition.

The collapsed back-end side navigation now has a less annoying 200ms delay.

The variable errors will be included in a CMS page when redirecting via Redirect::withErrors($validator).

Added new utility command for compiling back-end assets october:util compile [assets|js|less].

Improved asset caching (cms.enableAssetCache), when enabled the server will send a 304 Not Modified header.

Introduced new Table widget and DataTable form widget.

There is now a simpler way for sending mail via Mail::sendTo().

The List Filter query can now be extended with controller override listFilterExtendQuery().

Add new methods propertyName() and paramName() to Component base class for accessing names of external properties.

Native alert and confirm functions have been styled in the back-end.