From:worldofwarcraft.com 

We're pleased to announce that along with the other companies that make up Vivendi Games, we are merging with Activision to form a new global entertainment organization called Activision Blizzard (pending shareholder and regulatory approval). Similar to our previous arrangement, Blizzard Entertainment will now operate as a division of this new organization.

There will be no changes to our games, our websites, our personnel, or our day-to-day operations as a result of the deal. However, this combining of resources will benefit all of the companies involved and will further strengthen Blizzard's ability to continue delivering high-quality content for our players around the world for many years to come. To learn more about this exciting new development, please read our Activision Blizzard FAQ.