No, Perl 6 is a completely different language (now called Raku, because otherwise it sounds like a newer version of Perl 5, and never intended to be compatible

No, Perl 6 is a completely different language (now called Raku, because otherwise it sounds like a newer version of Perl 5, and never intended to be compatible with Perl 5). But because of the Perl 6 situation, even a change the size of the Python 2 to 3 change would be a "Perl 5" version update. I think having Python 2 vs. 3 is a clearer demarcation, myself, but the Perl community cares a LOT about backwards compatibility.