You can already run some CPAN modules in Rakudo (Perl 6) on Parrot. See Blizkost (which comes with Rakudo): https://github.com/jnthn/blizkost

Here is an example which works (using CGI module from perl5/CPAN):

    use v6;
    use CGI:from<perl5>;

    my $q = CGI.new;
    print $q.header,
        $q.start_html('Hello World'),
        $q.h1('Hello World'),
        $q.end_html;

PS. re: some CPAN modules - Only "well behaved" Perl5 modules will work. I've tried four and got one to work. However this is a good start methinks!