In these pictures we get a front and back image of the box showing off his gimmick on the back and his ugly mug on the front.
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EDIT: Here's my best interpretation of Megatrons profile.
Trapped in the black, crushing depths of the sea, his mind inert in the grip of stasis lock. MEGATRON knew nothing of the desperate search for his remains by the other DECEPTICONS. When he was finally brought back online, their effort and sacrifice meant little to him. The only thing that had any meaning was revenge. He would have his vengeance against the human boy who cheated him of his prize, and he swore to celebrate of the smoldering wreck of Optimus Prime
