All Wikipedians are called to a vote for changing of the license agreement from GFDL to double licensing under GFDL and CC-BY-SA.
The voting was made necessary mostly because GFDL doesn't scale well when it comes to publishing Wikipedia content in other forms like paper or DVD, which caused to legal uncertainties. The double licensing is negociated between the Wikimedia Foundation and FSF who holds the GFDL licensing right. It was a very difficult negociation that went two years. There were also a very long during discussion on mailing list and on the meta page about this license change, where different issues and positions were discussed in every detail.
Now we endly are moving on. I think this license change is very important because the current situation is hindering our effort of outreach.