There is a new maintenance update to WordPress core: version 5.0.2. This release only impacts installs on the 5.0 branch of WordPress. If you are on a version lower than 5.0 you will not see an auto update. 5.0.2 addresses 73 bugs and results in an overall faster experience using the new editor.
For details on this release you may reference the official blog post on WordPress.org: https://wordpress.org/news/2018/12/wordpress-5-0-2-maintenance-release/
As a WP Engine customer, no action is required. Our team is already working to push out automatic updates to your site(s) on the 5.0 branch to ensure they are on the latest version. You will receive an email notification when the update has been completed. Our team is always attentive to our promise to provide a secure WordPress experience for all WP Engine customers.