Thank you for your interest again. As this is a major release and we are really focused on production usage, we will wait until the next MongoDB release to publish it as cluster solution. This way, users who want to use MongoDB in production environments don't need to change to this new major version just after its release.
However, if you want to try this new version using a cluster, you can use our containers to test your application and the improvements this new version includes.
Sorry for the inconvenience.