The two new Metal Gear Rising announcements are for Japan only, accessible at different levels of difficulty for fans outside. The easiest to acquire is the demo, which will be available on the Japanese PlayStation Store on December 13 for those who don't already have it from the Zone of the Enders HD Collection. Getting that is as simple as creating a Japanese PSN account, or waiting for the inevitable western release.
The special edition Metal Gear Rising PS3 will be a bit harder to get your hands on. The 250GB system, with a special controller, copy of the game, and a few exclusive downloads, will retail in Japan for ¥31,960 ($390), but it'll likely more to import one.
It's easiest of all to watch the new Japanese trailer, featuring lots of ninja technique demonstrations. It's embedded after the break.