I know this was published a while back, at the first of the year actually, but I've never seen any kind of opinions about this or theories. There are a few threads from when this info was released but none really go anywhere and no one is really giving much effort to it.
If you go to this page [ Register or Signin to view external links. ]
And go to the very last page, page 7, it describes that there is another way to end the game besides dying, this also means quitting the game or leaving.
This is obviously legit. For one its in Playstation magazine and a Treyarch staff member is the one telling us this.
So what the hell is he talking about when he says an alternative ending? Is it something like Alcatraz? Or is it something that will be available after all the maps are released. I have a feeling that the Nav Cards will have something to do with it. But it might not be possible until after all maps are unlocked.
Give me your thoughts and opinions on this and see if we can find this alternative ending. Worth a shot.

Like I said, I know this was released a while back but no is trying to find it out. So don't flame for something that people gave up on.