Perl Kurila is a dialect of Perl.
It is based upon Perl 5,
Unlike Perl 6 which is a completely new language,
Perl Kurila is an evolution Perl 5.
Currently they are almost the same,
but this will change as Perl Kurila evolves.
Keep Perl 5 alive,
and not let new development be drowned by its burden of legacy features.
To have a more evolving language without being held back by backwards compatibility.
Because of backward compatibility Perl 5 can only be extended by adding more,
making it more complex.
By creating a new dialect,
we are free to have a more coherent Perl,
with cleaner internals.
There is a lot of Perl 5 code.
You can probably convert Perl 5 code to Kurila without much problems,
but if you are happy with Perl 5,
you can stay using it.
Both can be installed at the same time.
Kurila has just started,
so at the moment it is primary interesting for people interested in experiments with the Perl language.
People interesting in continuing Perl 5,
without all its legacy features,
who don't want to let Perl 5 become a white dwarf.