The official Japenese Metal Gear Rising Revengeance site has been updated with merchandise, that can be won through a lottery by purchasing certain editions of the game at certain stores (for the exact rules go here). The prizes include iPhone cases, posters and even a Raiden mask.
Speaking of cases, Hideo Kojima also showed a new iPhone 5 case with a Raiden artwork and a blue background. This seems to be a different one from the case that can be won through the lottery though, going by the picture above.
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