This is being discussed in various threads on foundation-l:
http://lists.wikimedia.org/pipermail/foundation-l/2007-December/thread.html (Apart from the first message, all messages this month so far is on this topic, so I just linked you to the archive.)
I had also posted this on WP:VPM with all of 1 response. :D
http://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28miscellaneous% 29#GFDL_.2F_CC_announcement
KTC