Images have appeared online via several Facebook groups showing off what appears to be a Masterpiece version of Shouki - the leader of the Trainbots from the "Headmasters" cartoon series. Along with his fellow Trainbots, he could form part of the Combiner, Raiden. This group of G1 toys was only released in Japan and thus far the entire group has not yet been updated outside of a Million Publishing exclusive of Shouki as a Classics Astrotrain redeco.
Take these images with a grain of salt, but if true this represents the first time Takara Tomy will be creating a Combiner on the Masterpiece scale such as this. Once official information is posted it will of course be made available here!