If the Autobots waged a battle to destroy the evil forces of the Decepticons, and they actually won, would we be pleased? Of course not! Then we wouldn't be able to get them to do mo-cap for new Transformers games. Specifically, Transformers for the Wii, DS, and Xbox 360

The most recent issue of Nintendo Power seems to confirm this, with three Nintendo games coming out based on the movie:

Based on the upcoming Michael Bay flick, Transformers will let you play as either the heroic Autobots or evil Decepticons. Each 'bot will come equipped with unique weapons, moves, and transformations. Activision is planning a Wii version and two DS versions of the game.