Hi Jeff,
The Drools Flow BPMN modeler is in fact not a real BPMN modeler. It was made to model the ePDL language and later extended to serialize this model to BPMN. But it does only support a very limited number of BPMN constructs. This new BPMN process editor is fairly complete because of its use of the Eclipse MDT-BPMN project as the underlying model.
Regards,
Koen