While I still say Journey has a legitimate shot at Game of the Year, the second half of 2012 features two titles that may eventually vie for the overall highly prestigious crown.
One is no surprise (to me, anyway): Assassin's Creed III is not only the next entry in one of the best new franchises of the generation, it also takes the requisite steps to separate itself from past iterations. It's not Brotherhood or Revelations ; it boasts an entirely new setting and main character, and that character is more complex and diverse than ever before. You've got the fantastic new AnvilNext engine, an environment that should be intriguing to any American (or indeed, anyone interested in history), and a level of freedom and seamless gameplay that may be unparalleled.
And then you've got Dishonored , which is technically a new IP but easily reminds one of Bethesda's massively popular Elder Scrolls series. However, the new project from Arkane Studios may not be quite as vast and wide open, and it seems to implement more elements from different genres. This wickedly interesting blend of Bioshock , Fallout , and yes, maybe even Assassin's Creed , could be downright intoxicating. Like ACIII, you can probably approach most any given obstacle or mission however you see fit, but at the same time, the various storylines could be excellent as well.
These are two games that could, theoretically, have it all.