It's basically a voiced-over comic book. The film is just a series of stills showing the events before the Transformers left their planet, and the human events since Megatron and the Allspark arrived. Some cheesy voice on the humans, but with Megatron / Prime's original voices from the cartoon. Mostly just uses the movie's soundtrack.
Might be best watched AFTER the movie, since some of it's content will ruin surprises for you. I just happened across it out of luck, but you may need to eBay it now since it was only released with one of the limited editions of the movie. It has references to the cartoon, not just the movie, like Starscream's ambitions for leadership of the Decepticons.
Overall, fairly nice for collectors but nothing to worry about if you only really liked the movie. Good for 20 minutes of fun if you're a Transformers fan.
Might be best watched AFTER the movie, since some of it's content will ruin surprises for you. I just happened across it out of luck, but you may need to eBay it now since it was only released with one of the limited editions of the movie. It has references to the cartoon, not just the movie, like Starscream's ambitions for leadership of the Decepticons.
Overall, fairly nice for collectors but nothing to worry about if you only really liked the movie. Good for 20 minutes of fun if you're a Transformers fan.