Disclaimer: I am IGN's mobile games editor. Thought NeoGAF might be curious about the winners. IGN's overall picks for 2012 Game of the Year are now live:
http://www.ign.com/wikis/best-of-2012/Best_Overall_Game
WINNERS:
Action: Dishonored
Adventure: The Walking Dead
Fighting: Persona 4 Arena
Platfom: New Super Mario Bros. U
Puzzle: Crashmo
Racing: Trials Evolution
RPG: Mass Effect 3
Shooter: Far Cry 3
Sports: FIFA Soccer 13
Strategy: XCOM
Multiplayer: Halo 4
Graphics: Halo 4
Music: Journey
Sound: Halo 4
Story/Writing: The Walking Dead
BEST OVERALL GAME: Journey
http://www.ign.com/wikis/best-of-2012/Best_Overall_Game
WINNERS:
Action: Dishonored
Adventure: The Walking Dead
Fighting: Persona 4 Arena
Platfom: New Super Mario Bros. U
Puzzle: Crashmo
Racing: Trials Evolution
RPG: Mass Effect 3
Shooter: Far Cry 3
Sports: FIFA Soccer 13
Strategy: XCOM
Multiplayer: Halo 4
Graphics: Halo 4
Music: Journey
Sound: Halo 4
Story/Writing: The Walking Dead
BEST OVERALL GAME: Journey