jdporter thank you bringing up this subject.
I love Perl6 but I personally dislike the idea of a separate site. Instead, we should create a more appealing design for Perlmonks. I've been using stackoverflow lately and I think it has a nice soft design while housing an incredible number of platforms and languages. A smart tag system is most helpful in organizing the contents.
As for the implementation language; I guess it would be up to the volunteers. I wouldn't mind a Perl 5 CGI::Application or Catalyst based site. On the other hand, the more Perl 6 we use, the more momentum we have for our new Perl. Hard to decide.