Bernd,
Can't speak for everyone, of course, but I think you've definitely contributed considerably for jBPM3 and surely know your way around. So don't feel un-welcome in any discussion about it!
Nevertheless, I think you can't blame people for not liking the fact that you more or less 'left' the JBoss/jBPM community in favour of Activiti ;)
Good to know you guys at Camunda keep an eye open this way though; helps us to stay on top of our game!
Regards,
Maurice