Drools Guvnor will support editable BPMN2 processes, in the browser, via Oryx. You can also synchronize those .bpmn artifacts with Eclipse, allowing BPMN2 round trip authoring between eclipse and guvnor. This could for example be used to achieve collaboration between business analysts (high-level editing using web tooling) and developers (adding execution details using Eclipse).
You can watch the video showing this in action here.
Great work Kris, and thank you Antoine for you help.