Some details on the FDL revision from the second audio file linked from: http://creativecommons.org/weblog/entry/6019
• 95% done.
• 3 licenses, Russian-doll style.
• A “simple fdl”, for example for wikis.
• BY-SA interoperability a goal. CC have been working with them on this.
• No invariant clauses. This removes my only practical objection to compatibility!
• Some ominous rumblings about flexible copyleft.