A new mode for Resident Evil 6 entitled "Agent Hunt" will allow players to take control of a monster.
Agent Hunt will become accessible once players have cleared the main game. You'll then be able to become a creature in certain stages. A human-controlled main character will still be present in these stages but said player won't know which one of the creatures present are human-controlled or controlled by the AI; the player will only know that another human player has entered the game.
Multiple creatures will be able to attack a single-player, with voice chat being an option that can be utilized in order to plan the attack.
Resident Evil 6 is currently scheduled for a worldwide launch on October 2, 2012.