Lets look into the future gents, and predict what your 2013's 2012 GOTY will be, based on everything you know about the games that are out, how you feel about those genres, what you think you will get our of those games etc. Sure, surprises can happen, but from what you have and have not played this year, what do you think will be at the top next year (from this year).
Mine is a easy anwser, Far Cry 3. Im sure I will love this game, I just didnt get around to buying it, and even if I did now, I probably wouldnt have time to play it before 2013. It helps that its 1 of 3 major releases I didnt play this year (well, that are out on PC at least), the other 2 being Assassins Creed 3, which will never win since Im still way behind on that series (only played 1 and 2), and Mass Effect 3, which I probably wont even play until there is some sort of GOTY edition with all the DLC.