If you want an inside track on the future of free content licenses you could hardly do better than watch or listen to recordings of two Wikimania sessions — Lawrence Lessig on The Ethics of the Free Culture Movement (particularly the last twenty minutes) and Eben Moglen on Document Licenses and the Future of Free Culture, which also features Q&A with both Moglen and Lessig.
You’ll recognize this discussion if you followed Lessig’s series about the history and future of Creative Commons from the end of last year.