Well Larry keeps saying that we will be able to tell perl6 from perl5 by the "use" lines changing. Hopefully some time in the next couple of years you'll be able to tell 5 vs. 6 posts apart that way as well.

# perl 5ish
use strict;
use warnings;
use diagnostics;
use CGI;

#perl6ish
pragma strict;     #
pragma warnings;   # No guarantees on what he picks for command names!
pragma diagnostics;#
method CGI;        # They might all be "method" or "invoke" or "%#$" =
+)
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At worst, vroom adds a checkbox for "perl6?" and defaults it off for all old posts...

--
$you = new YOU;
honk() if $you->love(perl)