Demo for the highly anticipated Metal Gear Rising: Revengeance will be released next week according to the developers of the game, Platinum Games. The demo for the game is set to be available on the Xbox 360 and PS3 on the 23rd of January.
Keep in mind that this game is a spin-off title, and it does not have Hideo Kojima involved in any creative capacity.
Furthermore, this game will star Raiden as the main playable character and not Solid Snake. From what we have seen so far the gameplay of Metal Gear Rising: Revengeance has more similarities with the Hack n Slash style of Devil May Cry instead of the stealthy approach of Metal Gear Solid series. The full game will be released on the 19th of February for the Xbox 360 and the PS3.