The GPD was taken out of the main jBPM project in JIRA to be able to define an independent release cycle. So I have to really quickly put some effort in defining releases for the GPD and migrating all the existing open issues from the GPD module in the main jBPM project to the GPD project. I'll try to do this shortly. The bottomline is to use the GPD product in JIRA for all issues about the GPD.
Concerning the separate forums, this would have advantages and disadvantages. Personally I am inclined to leave the situation as simple as it is now...