Hibernate Core 4.0.0.CR5 has just been released.
We are releasing a new CR because of a classloading issue (HHH-6715) affecting applications that integrate with Hibernate. In addition, some bugs were fixed and some improvements were made that should improve performance.
For more details, see the JIRA release notes.
The artifacts have all been published to the JBoss Nexus repository under the org.hibernate groupId at http://repository.jboss.org/nexus/content/groups/public-jboss/.