EF Core release notes for each version can be found in the GitHub Releases page.

You can try EF 9 before it goes GA using the daily builds or a preview release:

• Release notes for EF Core 9 preview 1

This issue is for general discussion around the EF Core 9 preview releases. See What's New in EF Core 9 for details on new features introduced as the EF9 work progresses.