[pavelbr]

Perl6 isn't an update to Perl5. It's a completely unrelated language with a misleading name.

[24gttghh]

They may not be compatible but they certainly seem at least related.

[eikenberry]

You could easily argue the same is true with Python2 and Python3.

[b2gills]

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.