I am asking a personal question that is that the software which bitcointalk is going to adopt in the future or it is your own custom software for your forum?
Sorry for the late reply. The forum was originally placed into read-only mode, but then the forum admin started redirecting the old domain. We're still trying to sort out a couple issues with the redirection. If anyone wants to visit the old forum, it can now be done at the following link...
http://old.peercointalk.org/
Also, the forum software we're using is Discourse, which you can find here...
http://www.discourse.org/