If you're planning to pre-order the PS3 or Xbox 360 version of Transformers: Revenge of the Fallen, you might want to place your order at GameStop. They're giving away exclusive downloadable skins and a keychain to those who pre-order.
The keychain contains the download code for the skins, which are basically just gold recolors of the characters' original in-game skins. Would've been cooler if they were old Generation 1 skins, but that's just me. Hopefully those will show up as free DLC, but knowing Activision I kinda doubt it would be free.
- Activision planning DLC for Transformers: Revenge of the Fallen
- Transformers: Revenge of the Fallen gets official game, trailer