Metal Gear Solid: Peace Walker

Metal Gear Solid: Peace Walker is an upcoming game in the Metal Gear series to be released for the PSP in 2010, with Big Boss being the main character. The game was officially announced at Sony's E3 press conference on June 2, 2009.

The game will be set in 1974, 10 years after the events of Metal Gear Solid 3: Snake Eater. The setting is Costa Rico, a fictional island possibly based on Costa Rica, and depicts the rise of Outer Heaven.

Development
The team that made Metal Gear Solid 4: Guns of the Patriots will return to develop Peace Walker. Hideo Kojima is writing the script and producing the game, stating that the game is not a spin-off, nor is it a side-story. Kojima has also described it as the "missing link" in the Metal Gear series.

In a trailer for the game, multiple Big Bosses can be seen, possibly indicating multiplayer or co-op gameplay.