I preordered Black Ops II last. I don't think I'll be pre-ordering COD: Ghosts. Doesn't look very "innovating" to me. The new engine does not look "new" at all. It just looks like they tweaked the engine from the last Modern Warfare. I think the Call of Duty series is slowly dying.
If you don't count buying alpha state games: I think it is Company of Heroes 2. Boy, was I disappointed when the game got out. Made a special account to follow the development forum, suddenly bankruptcy happened.