IGN won't be naming their GoTY until Jan 11th, but they have already posted the GoTY for each individual console along with a whole bunch of other awards.
GoTY Contenders
Wii - Super Mario Galaxy
PS3 - Uncharted: Drake's Fortune
360 - Call of Duty 4: Modern Warfare
PC - Bioshock
PSP - Syphon Filter: Logan's Shadow
DS - The Legend of Zelda: Phantom Hourglass
Click here to see the other numerous awards.
There you have it, the IGN 2007 GoTY will be (or least one would think it would be) one of those games.