Thanks to "Megatron Said" for the heads-up.  Masterpiece Megatron is available for pre-order at bigbadtoystore.com.  There's a shaded out picture that looks more like a computer 3D graphic than an actual toy silouette.  Shipping weight is 4.2 pounds!  Sure, a lot of that could be cardboard, it might also mean die-cast metal parts, similiar to MP-OP.  We'll see.

They also state a very interesting piece about the gun barrel:
" Due to United States Toy / Imitation Gun Laws, it is illegal for any business or individual to import the MP-05 Megatron because it does not have a blaze orange safety tip on the end of barrel. A copy of this law is listed at the end of this description. In order for BBTS to legally import this item, Megatron must be modified. A blaze orange safety tip will be added to the end of barrel...  Without this orange tip modification, US Customs will seize any incoming shipments for this item that they discover because it does not comply with US Laws, so we are providing a legal and risk-free solution to that problem."

More information at bbts.com!