A new version of Metal Gear Solid is on the way to the PSP... sorta. As part of Sony's PlayStation Premier event today in Tokyo, Konami announced Metal Gear Solid Portable Ops +, an expansion to last year's Metal Gear Solid Portable Ops.
The new version of the game is focused on online play, with new stages and characters. However, Konami is also adding a mysterious new single player mode, Infinity Mission.