I think you mixed things up
GPD4 uses BPMN symbols as far as possible, but it contiously has a JPDL4 processdefinition.
The JPDL(3) export you saw is 'exporting' JPDL3 from the eclipse BPMN moddeler.
Exporting to BPEL has never been possible with JBoss designers
Thanks for the claryfing words. This helped a lot because I really mixed things up. So there is the jBoss GPD and a BPMN-Modeller for Eclipse and they are 2 different things, right?