Konami has revealed that if you buy the Collector’s Edition of Metal Gear Rising: Revengeance, you will receive a special ‘high frequency plasma lamp’.
Update: High quality render:
It seems to be one of those lightning plasma lamps, but this one has Raiden’s sword on the inside. The Collector’s Edition will also come with a soundtrack and obviously the game itself.
Konami has not yet revealed a price for the Collector’s Edition.