The document outlines the features and improvements in the Mediamosa 3.0 release, including confirmed functionalities such as OpenAPI support, OAuth for secure API authorization, and oEmbed for content embedding. It highlights enhancements like Solr support for faster metadata searches, improved administration role management, and workflow improvements through the conversion of tools into modules. Additionally, it mentions future plans for Mediamosa version 3.5, focusing on digital management and enhanced media handling capabilities.