Video available of this announcement. You can watch Stallman give an overview of the major changes in the license, and his reflections on the drafting process.
Highest Quality (103MB): http://gplv3.fsf.org/static/release/rms_gplv3_launch_high_quality.ogg
BitTorrent: http://gplv3.fsf.org/static/release/rms_gplv3_launch_high_quality.ogg.to...