The new DS version of Transformers will come in two separate versions, à la Pokémon.
You can choose the Decepticon version, which will see you destroying the Earth, or the Autobot version, where you save it. Both games include wireless multiplayer for up to four people and customisable vehicles, while each version will have some exclusive levels.
The game will be released alongside the movie, which is virtually guaranteed to be awful. A toy line is not a good basis for a film.