That is one heavily chromed Optimus toy. Hasbro have suddenly gone nuts with shiny plating lately... maybe they found a factory that does it cheap, and are trying to put bling on as many toys as they can to make them "pop" from the store shelves at kids and parents.
(hope it doesn't flake or rub off like a lot of previous toys... but longevity isn't a concern for toys, as long as it doesn't come off within a couple weeks out of the box)