Fan2Fan have revealed some more details about Masterpiece Megatron

Kremzeek figure included (different mold from the one that comes with Kiss Players Autorooper x Atari)
– Working Trigger action when in Gun mode
– Same size as MP-01 G1 Convoy!!
– LED gimmick in scope
– Die-cast parts
– Memorable accessories include energy mace, laser-cutter and gun from Transformers The Movie (used by Megatron in the fight with Optimus Prime).
– New transformation designs and concepts, for example moving the trigger part to the legs, improving overall Robot proportion.
– Due to toy gun regulation in the US, Walter P-38 Megatron was never in the plans when the Japan team worked with the US team. MP-05 Megatron is designed and developed solely by the Japan team, solely for the Japan market.