Here's an FAQ about the just-announced merger of Vivendi, Blizzard and Activision direct from Blizzard's website.
Q: Will Activision and Blizzard now share development teams?
A: No, both of our companies will continue to operate as they have previously with regard to game development.
Q: Will the release schedules for any Blizzard games be impacted?
A: No, the transaction will not have any impact on our games, our day-to-day operations, or our release timelines.