It is not dead.

Here is the updated roadmap for PicketLink3.  https://docs.jboss.org/author/display/PLINK/PicketLink3.0-Roadmap

We have been active on the mailing list   security-dev@lists.jboss.org   You can subscribe to it at https://lists.jboss.org/mailman/listinfo

You should also monitor confluence for some activity.  https://docs.jboss.org/author/display/PLINK/Home

We are trying to revamp the website etc.  It takes time unfortunately.