WordPress 4.9.8 was officially released on August 2nd. It included “18 Privacy fixes focused on ensuring consistency and flexibility in the new personal data tools that were added in 4.9.6.”
Also with this version, developers should note the
register_meta() function supports registration of metadata not only for an entire object type but also for a specific object subtype, such as a specific post type or taxonomy.
The 4.9.8 release also included the rollout of the Gutenberg callout. Gary Pendergast explained how it works: If Gutenberg is not installed or activated, the callout will be shown only to users with the Administrator role. If it is installed and activated, the callout will be shown to all user roles from Contributors to Administrators. For those with the Classic Editor plugin installed and activated, the callout will be hidden for all users.