The PlayStation Blog has some details, as well as video that goes into SOCOM 4’s co-op game mode. Up to five players will be able to join in for co-op game play. Two main game types are available in co-op: “Takedown,” which requires teams to clear out enemy-filled locations in search of opposing VIPs that the team must neutralize however they can; and “Espionage,” which turns the focus to intelligence gathering, where teams must work together to track down enemy data and sabotage their local operations.
Before each match, teams will be able to adjust both the overall difficulty and the density of the enemy soldiers positioned on the map. Players will have to call out enemy soldiers, and objectives to their squad mates in order to succeed
Check out the video to see some of the co-op mode in action, and be sure to check out SOCOM 4 when it hits April 19, 2011.
Source: PlayStation Blog