I've been a skeptic of XPDL as the pre-eminent format for BPMN-drawn Models, but I've also been encouraged by Keith Swenson's efforts to prove that it could be the de facto standard for BPMN model exchanging.
But it looks like my judgment that XPDL would only catch on with vendors like Lombardi (who have been beating the drum for BPDM and BPMN2 for some time) only if BPMN 2.0 didn't sufficiently address the interchange problem might be a little off.? Lombardi just announced that its Blueprint July '09 release supports XPDL!? It could be that Lombardi is voting with its feet - perhaps BPMN2 doesn't seem to solve the problem(s) they were hoping it would with regard to model interchange.? Or, perhaps they see XPDL interchange as the Right Now solution, and don't see an advantage in waiting on BPMN2 support. After all, not only would Lombardi have to build the BPMN 2 export/import functionality, they would then have to wait on myriad other modeling tools to pick up the baton in order for there to be anyone to "interchange" with.
By picking up XPDL support, Lombardi Blueprint can now exchange models with a host of other modeling tools listed on the XPDL vendor site (perhaps Lombardi will now be added to the site).? Bruce Silver has already assessed portability between Blueprint and Process Modeler for Visio.
Update:? more info from Keith Swenson on his blog, regarding exporting from Blueprint and importing into Fujitsu's Interstage BPM.