Reading comprehension is always everyone's strong point on this forum.
Do you realize that Vivendi bought Activision and merged Blizzard with them? Why would you assume that Blizzard is being sold too? Every article I have read clearly says Activision, not Activision Blizzard.
Activision and Blizzard Entertainment are still separate companies. Activision Blizzard does not publish games, they use Activision or Blizzard, whichever would have released the game before. As such, I don't know why you would think it's both of them possibly being sold.
You think the news article would be plastered about how WoW's company was being sold, but it only ever mentions CoD.
I really enjoyed the comments on other sites where people were suggesting Activision simply buy Blizzard. At least I haven't seen one of those here yet.