It seems that Hasbro's love of repaints will continue with the Transformers: Revenge of the Fallen toy line, at least based on possible toy leaks to various websites (or they could just be custom jobs). Click the links below to view the galleries for each.
Voyager Optimus Prime
A possible repaint for Voyager class Optimus Prime with metallic blue paint, longer flames and gray front cab. Personally I don't see how it’s much of an improvement and worth a release of any kind.
From an EBay auction it appears that Voyager Megatron got repainted in his Generation Two colors. This one strikes me as a likely custom job and not a potential Hasbro release but just in case posting about it.
NEST Deluxe Bumblebee
From TF08.net, below is a single image of Deluxe Bumblebee with NEST logo on the side door.