Movie Keychains Reveal New Characters Outline

{mosimage} TFW has images of several upcoming Revenge of the Fallen character keychains.  The only keychain fully shown is Bumblebee, but three others are blacked-out outlines.  They include Starscream, what appears to be Megatron, and a new design for Optimus Prime – perhaps combined with another character?  Check it out over at TFW!