ahmedjbh released a new coop mission for the Duala Island in the BI forums.

Quote ahmedjbh :
Simple map, very tough, but fair

You will need to monitor ammo, use dead bodies for gear, run from stronger forces and most importantly plan your attacks and movements. The map is purposely "unbalanced" you don't all start with the most deadly weapons, so you have to use what you have to the best effect.