Perl 5.11.0 is a DEVELOPMENT release.
This release is the result of over two years of development by a global community of developers.
You can find a list of high-profile changes in this release in the file "perl5110delta.pod" inside the release.
You can download the 5.11.0 tarball from:
http://search.cpan.org/~jesse/perl-5.11.0/The release's SHA1 signatures are:
0d436577386c668161e3dad385d233c383bf4c9d perl-5.11.0.tar.bz2
3137486cfe00094d1cd9a00e6e61f152f8fdb26e perl-5.11.0.tar.gz