No matter how many brilliant innovations or gameplay improvements they add to Call of Duty: World at War, every reviewer in the known universe will complain endlessly about it being a WWII game, and therefore it will not sell as well as if it was a modern setting.
I also call that as soon as they come out with a game that has a brilliantly written, completely believable character who attains the status of "badass" through possible means, the Halo fans will flood the online modes and ***** endlessly about how much more fun Halo 3 is and how gay this (hypothetical) game is.
(EDIT) I also call that when Spore comes out, everyone will ***** about how much higher their expectations were and how disappointed they are, regardless of how good the game actually is. I will go so far as to predict that even I will feel this way, but unless the game is genuinely not fun I'll keep playing it until I forget all the pre-launch hype, and then wonder why I didn't appreciate the game fully when I first played it.
I also call that sooner or later someone wll be sued for his douchebaggery over Xbox Live, and he will deserve it.
I also call that if Namco doesn't put Darth Vader on Xbox Live for Soulcalibur IV, I will end up buying the game again when I get a PS3, even though the only difference between the two versions is the Vader/Yoda one. Yes, playing as Darth Vader really means that much to me.