Strapi has released version 5 "release candidate" of its headless CMS, which includes new features such as content-versioning, the Document Service API, improved data response structure, and a migration tool for easier upgrades. The content-versioning feature allows users to prepare draft versions of content before publishing, while the Document Service API replaces the Entity Service API with new methods like publish(), unpublish(), and discardDraft(). Additionally, the data response structure has been simplified, and partial support for Relay-style queries has been added to the GraphQL API. The migration tool aims to streamline the process of upgrading between Strapi versions.