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This is kind of weird.

• The Wikimedia Foundation wants to hold a vote on whether to distribute Wikipedia under a Creative Commons license, but
• All existing Wikipedia content is licensed under the CC-incompatible GNU Free Documentation License, and
• Getting permission from all the contributors to change the license would be impossible, but
• Most invocations of GNU/FSF licenses (including Wikipedia's) permit distribution under any later version of the given license, so
• The Wikimedia Foundation prevailed upon the Free Software Foundation to release a new version of the FDL specifically giving Wikipedia (and wikipedia-like “Massive Multiauthor Collaboration Sites”) a time-limited option to switch to the Creative Commons Attribution Share-Alike license.

It's a clever hack. On a practical level it seems justified given it would be impossible to relicense under any other means. On the other hand, I don't really think it's something that anyone would have had in mind when they placed their work under the FDL.