I'll see your Perl5 and raise you some Perl6:

    @list.map(*.description).grep(?*).join("\n")

That can't be Perl, I actually understood it.

That is starting to look more like J or K than Perl. Is the Perl 6 team still considering syntax changes? If so, any thought on making map/grep/join operators?

map, grep and join are subs as well as methods. Perl6 is a multi-paradigm language and of course there's more than one way to do it - even when using the same operations.

Instead of chaining methods, one could also use

    # p5 style
    join "\n", grep ?*, map *.description, @list;

    # dataflow style
    @list ==> map *.description ==> grep ?* ==> join "\n";
    join "\n" <== grep ?* <== map *.description <== @list;

Perl6 allows you to define your own operators:

  $ perl6

  > sub infix:<J>   ($sep, @list) { @list.join($sep) }
  > sub prefix:<J,> (@list)       { @list.join(',')  }

  > ':' J <one two three four>;
  one:two:three:four

  > J,<five six seven eight>;
  five,six,seven,eight