Yes, the closest I came to PF was the GING project (GING Is Not GING). It was a Debian back-end, with a FreeBSD kernel (with the PF module). Of course it was frozen, even though one of my favorite OS'es.

I think the reason we don't see PF even being talked about, in any sort of development; is that Theo De Raddt wouldn't allow it. I think I did read on a cached page, that he was making sure people didn't port it, to keep it as a BSD specific module of awesomeness. If he saw PF IP Filter as an installable package on Ubuntu (non-LTS), he would probably have a heart attack; or hunt down the person that ported it, and cut off his or her fingers.