Activision is the reason these games are churning out like clockwork. Another one every year. Exactly how much influence they have is hard to say. From what I've heard however, some of these things are in Activision's hands, such as Map Packs and Beta decisions.
Personaly I would LOVE an Open Beta for Call of Duty: Black Ops 2! Who wouldn't? It is also true that
Infinity Ward and Treyarch, would be able to patch more glitches and bugs that they probably wouldn't find on their own. But one concerns that Infinity Ward and Treyarch might have, is that it might influence potential buyers in the wrong direction. And that the buyer might be thinking that Black Ops 2 is going to be an awesome game, and when they try the Beta, they will quickly change their mind about getting the full game, and then everyone involved in the Call of Duty: Black Ops 2 game will start to lose sales. But like I said before I am all for an Open Beta.
Don't bother, we have said this so many times in this thread (and many others like it), yet nobody bothers to listen. Guaranteed, at least 22% of the people replying to this thread still believe that an open BETA is possible.