In a small but frequently requested improvement, GitHub now shows the date that an archived repository was put into read-only mode to indicate it is no longer actively maintained.
Previously, you could see that a repo was in the 'archived' state and probably infer from the commit log when it last saw activity, but the actual date the archiving happened was not surfaced anywhere. Now there's a date included in the "this repo is read-only" banner at the top of the repository view.
OpenID Connect (OIDC) for authenticating enterprise managed users is now generally available for enterprises using Azure AD.
OIDC allows GitHub to use your identity provider's IP allow list policies to control where PAT and SSH keys can be used to access GitHub from, with granular control down to individuals. Enterprise customers using OIDC can now select whether to use their identity provider's IP allow list policies, or GitHub's built-in allow list feature.