Today saw the release of the Metal Gear Rising Revengeance demo in the Japanese PlayStation 3 online store. At the moment it is only available to Japanese players (others can download it from the Japanese store, but won’t be able to install it).
You will be able to battle the enemies LQ-84i and Moonlight, among others.
In addition, the official Japanese site for the game has been renewed. You can check it out here.
The full game will be released in 2013: February 19 in the US, 21 in Japan and 22 in Europe.