Hi Sunay.
We are currently working at customers with BPMN in Signavio and transforming them on the fly in jPDL 3 code. This is a pretty handy approach with having real fancy BPMN process models but using the stable jBPM 3 in the back ground. If you are interessted send me an email: bernd.ruecker@camunda.com. We are even thinking about open sourcing that transformation, but haven't yet decided...
Cheers
Bernd