Following the JP exclusive black/stealth Bumblebee figure, another 3 are about to be released as exclusives in Japan.

- (silver) Defender Optimus Prime (Exclusive to Edion, Bic Camera & Yodobashi Camera stores),
- (white) Demolishor Shanghai Attack (Exclusive to Japan Toys R Us),
- (blue) Infiltrator Soundwave (Exclusive to Amazon Japan & Yamada Denki).

http://www.seibertron.com/transforme...e-gifts/18136/

I think the (red) Rampage was an exclusive in Japan as well, but since we are definitely getting that one released by Hasbro, those three will be chased up by collectors in case Hasbro don't release them at all.