This excerpt taken from the ATVI DEFA14A filed Dec 11, 2007.
1. Why will Blizzard operate as stand-alone business?
Blizzard currently operates as a separate business unit within the Vivendi Games organization. It has a unique business and revenue model and it makes good business sense to have it operate as a stand-alone business reporting to Mike Morhaime who, in turn, reports to Bobby.
The three Vivendi Games businesses that will report to Mike Griffith are more like the businesses that Activision currently operates.