I should also point out that I downloaded Indigo and tried installing the editor and i the following exception:
The selected wizard could not be started.
Plug-in org.eclipse.bpmn2.modeler.ui was unable to load class org.eclipse.bpmn2.modeler.ui.wizards.BPMN2DiagramWizard.
An error occurred while automatically activating bundle org.eclipse.bpmn2.modeler.ui (767).