Saints Row 2

The plot will continue on from the first game with "a much darker and more sinister story that leads your character down a path of betrayal, revenge and redemption against the city that has left him for dead. A preview by Gamespot states that the game is centered around the rebuilding of the Saints Row gang fifteen years after the first game, with three new gangs now in power around the city of Stilwater. Right now only one gang has been confirmed named "Sons of Samedi" which is a Jamaican gang that wear green as their gang color.

The entire single player campaign will be playable in online and local play co-operative mode. New vehicles include boats, motorcycles, helicopters and planes . The player will be able to use limpet mines on cars, walls, and other surfaces as well. The player will also be able to throw objects in the environment, like stopsigns or furniture. There will also be changes to Stilwater, including expansion of the west side of the city. The game will include additional weather effects. Pedestrians will be much more responsive to both environmental stimuli (such as opening umbrellas at the sign of rain) to possibly crowding around someone that has just been shot, allowing the player to use the distraction to get away. Alternatively, the player can attempt to use other characters in the game as human shields. The game's personalized characterization is expanded to to include the creation of female characters as a result of the player character's fate in the first game. Additionally, the player can also choose the way the character walks, talks, taunts and hold/shoots a weapon. The player will also be able to expand and customize their "crib" through the game. The activity system introduced in the first game will remain, though it will be completely optional as a break from the main plot of the game.

Source of information: http://en.wikipedia.org/wiki/Saints_Row_2