Well, as you might have read (or not) the jBPM project is in a kind of state of flux. I have not been in contact with the remaining project members so I could not tell you. It might work if you try to send Koen a private message through this forum. I'm currently writing a blog entry and will try to get in touch with him the comming days. I'll ask about the state of the GPD to.
Cheers,
Ronald