WordPress 5.8 introduces full site editing which allows building an entire site using blocks, including areas outside of content. The document discusses new features like full site editing, changes to themes in 5.8 including new widget screens and an optional template editor for classic themes. It provides an example of an FSE theme called Rick that can be downloaded and tested with the required Gutenberg plugin, and invites sharing ideas about WordPress 5.8 and full site editing.