as far as I know you will be able to play Resident Evil: Operation Raccoon City with 8 players into Co Op style with the unity of the players. You can make use of SN text Chat XBL Party Chat together 8 friends and create a Survivors room and invite those friend in the game. well I could not say whether opposite team would make use of PSN Chat/XBL. It is showing that players are able to bend the rules how particular mode can be played. However make sure that survivors are playing as totally human vs of infected cooperative style.