Techcrunch and Search Engine Land both seem to think Wikipedia is using a double standard by giving special treatment to their own website properties, because they are not nofollowing links to their own sites.
Why should they? Nofollow is supposed to indicate that the link is to a site that cannot be vouched for. Obviously, Wikipedia can vouch for its own sites, so calling it unfair or a double standard is just sensationalism or link baiting, in my opinion.