After all was said and done with Bethesda's E3 conference Arkane studios sat down with Adam Sessler and Moran Webb to answer some questions about the game. It was revealed during the presentation that Emily would be a main protagonist in Dishonored 2, Arkane Studios further elaborated on this and revealed that she along with Corvo will both be playable in the game. Following this many wondered if this would in some way lead to some form of cooperative play.
Arkane Studios has revealed this is not the case as together Corvo and Emily tell a singular story. It has also been revealed you will be unable to just switch between characters you will get an option to play as either of the characters and the one you pick is the one you are stuck with.