Overlord is an umbrella project for SOA governance related activities within JBoss. It is not a concrete project in its own right, but a place where ideas for potential projects can be incubated (such as the CDL/Process Governance work, Service Activity Monitoring, etc).
However when the work becomes mature enough, it is usually spun out into its own sub-project under the Overlord umbrella.
The work on Process Governance using CDL has been moved to the Savara project: http://www.jboss.org/savara
Therefore no further work will be continuing on the Overlord-CDL component.