Transformers revenge of the fallen the video game for the wii?

Okay so I just bought the game and beat the campaign mode I heard that their is online play and that you can choose to play alternate campaigns like autobot campaign and decepticon campaign. Also there are supposed a lot more characters such as rampage and grindor how do I unlock them. Finally if the wii verison doesnt have all these then does the PSP version have alternate campaignsand all of the characters?Transformers revenge of the fallen the video game for the wii?Don't know.