Originally the process governance work within Savara, that started in JBoss Overlord, did have the capability to generate JBossESB services as skeletons using a new set of custom actions. This was done to enable the communication structure to be inferred from the service implementation, and then compared back to the original choreography as a way to validate that the service was being implemented correctly.
However the approach was not felt mature enough to make available in the Savara project, and so instead we decided to concentrate our initial efforts on BPEL generation/conformance checking - as the generated BPEL has a natural stateful behavioural description based around communications - whereas the ESB service description does not.
The other reason for delaying providing a solution for ESB is the pending ESB 5 release, which changes the way in which services are defined.
So to answer your question, we will revisit this feature in the future based on ESB 5. I thought a feature request already existed for this, but could not find it, so have created: https://jira.jboss.org/browse/SAVARA-142