Both users and organizations now have the ability to request an archive of their repositories, issues, comments, and other data using the Migrations API. For more information see the developer announcement.
Global node IDs become an official part of REST API v3
The node_id attribute, used to identify GraphQL API objects from the REST API, is now officially supported in the REST API v3 for GitHub.com and GitHub Enterprise (versions 2.14 and higher). The node_id attribute will be included in all supported REST resources that have a corresponding GraphQL object, and you can use this information to help move between the REST API and the GraphQL API.
You can now view prior revisions of a comment by clicking on the “edited” dropdown in the comment’s header. Prior revisions are displayed as rendered prose diffs, and are visible to any user that can view the comment itself. If you need to remove sensitive information from the comment’s edit history, the comment author as well as any user with write access to the repository can remove the body of a prior revision when viewing the revision. For more information, see the documentation.