During the Tokyo Gameshow, Kojima Productions and Konami have release a new trailer of the upcoming Metal Gear Solid: Portable ops. This new Metal Gear game for Sony PSP is to tell the story before the rise of Outer Heaven, making it a prequel to the original 1987 Metal Gear, as released on our beloved MSX system. Thanks to gamevideos, you can already have a look at this 4 minute trailer right here.
Relevant link: Metal Gear Solid: Portable ops TGS 2006 trailer