"Perl 5 was my rewrite of Perl.  I want Perl 6 to be the community's rewrite of Perl and of the community."

--Larry Wall, State of the Onion speech, TPC4

This new version of Perl will bring, as far as I know, a lot of impressive features.
Anyway I think that you should try to learn Perl 5 in order to get familiar with the syntax and with some features that are unique to Perl, including its flexibility.
Anyway check out http://dev.perl.org/ for more information as well as other Perl related sites.