The demo for Metal Gear: Rising has already dropped overseas, and everyone in Japan has mysteriously called in sick today for work. Weird.
Konami has announced that they will be releasing the U.S. and European version of the demo in January 2013. Right now the demo is region coded to Japanese players only. So, even if you manage to download it using a Japanese PlayStation Store account, that shit is still on lock-down.
Konami says that a PlayStaion 3 and an Xbox 360 version are both in the works. We shall see, Konami, we shall see.