Hibernate Core 4.0.0.CR6 has just been released. The complete list of changes can be found in the JIRA release notes.
The main change that required another CR is HHH-6816.
The artifacts have all been published to the JBoss Nexus repository under the org.hibernate groupId. Or if you prefer, the download bundles are available from SourceForge in both ZIP and TGZ formats.