WordPress 5.4 released, improved block editor and APIs for developers
WordPress 5.4 “Adderley” was released a couple of days ago. This major update includes all-new social icons and buttons blocks, improvements to the block editor, and new APIs for theme and plugin developers.
WordPress 5.4 Alert! Theme & plugin developers prepare your items
As the WP Tavern states in their latest article on the upcoming WordPress 5.4 release, the theme and plugin developers should be well aware of the changes.