Fresh from Konami's own Twitter account, they announced that the demo for Metal Gear Rising: Revengeance will be coming out sometime next month on Xbox LIve and Playstation Network. This is the same demo that is already available with the $40 Zone of the Enders HD Collection, so you can play this demo already if you have that game.
I was personally disappointed when Konami region locked the Japanese demo of the game that came out yesterday on the Japanese Playstation Store, but this news is good enough despite waiting a little more longer. There was new gameplay footage released last week if you want to see how crazy this game gets below. Metal Gear Rising: Revengenance by Konami and Platinum Games comes out on February 19, 2013 for the Playstation 3 and Xbox 360.