Well, Perl 5.8.6 was released on Nov 27 and haven't be noticed here yet.

So, get it at http://search.cpan.org/CPAN/authors/id/N/NW/NWCLARK/perl-5.8.6.tar.gz and take a look at http://search.cpan.org/~nwclark/perl-5.8.6/pod/perl586delta.pod.