WordPress 5.6 is set to add a UI that allows users to opt into auto-updates for major versions of core. Previously, developers could turn these updates on by setting the WP_AUTO_UPDATE_CORE constant to true or by using the allow_major_auto_core_updates filter. Version 5.6 exposes this setting in the UI to make it more accessible for users.
Jb Audras posted a dev note on the feature yesterday with instructions for how developers can extend it to add more options.
A previous version of this UI specified that the