Did you PM Slavok? I think that would be a first step. The invitation was posted here: http://punbb.informer.com/forums/post/139252/#p139252 and I think that does give a good idea.
A fork already did happen and that is FluxBB, as you mention. As for Informer's role, I don't know what it really is, and don't think it matters to most people, but I know it does to some. For me, all I need to know is that PunBB is open source and that some developers are communicative and have what I consider is the right idea.
I'm happy with the way things are, and enjoy using the software as it stands. Of course there are always a few bugs and a couple of things which could be added, but when there is talk of development I always cringe. My fear is that features will be added (I hate "features" in all software) and we will see other fashion items creeping into the program. Hopefully this will not be the case here.
The community could use a bit more interaction though. There must be a lot of users out there who benefit from this software and it would be nice if they would drop by the forum from time to time and help answer questions. Certainly seeing only a couple of posts per day can be depressing.