Earlier quoted context omitted.
Perl6 isn't an update to Perl5. It's a completely unrelated language with a misleading name.
You could easily argue the same is true with Python2 and Python3.
With one main difference being that we are perfectly content to let people continue to use Perl 5. (Most of us anyway)
Another is that Perl 6 brings in many features from other very disparate languages while making them seem as if they always belonged together. It doesn't seem like Python 3 brings that many new features.