www.cpan.org has supported TLS since March. We're planning to make it TLS-only later in September, pending feedback. To start the process the homepage now redirects to the TLS version. Over the next days and weeks we'll make more and more of the URLs TLS-only.
Please let us know if this causes problems for common CPAN clients.
(IPv6 has also been re-enabled for www.cpan.org).