Yes, Bethesda's Dishonored: Death of the Outsider is a standalone title
During its pre-E3 press conference, Bethesda announced that Arkane Studios is working on a new standalone Dishonored game titled Dishonored: Death of the Outsider.
Similar to how Naughty Dog is handling Uncharted: The Lost Legacy, Dishonored: Death of the Outsider won’t be a simple DLC add-on for Dishonored 2 but will in fact be its own separate game. In Death of the Outsider, players will get to step into the shoes of Billie Lurk, the female assassin who was trained by the Knife of Dunwall himself, Daud (the same man who murdered Empress Jessamine Kaldwin), whom players got to play as in a DLC story campaign for the original Dishonored. In Dishonored 2, Billie Lurk was in hiding under the identity of Meagan Foster, an ally to the sequel’s protagonists Corvo Attano and Emily Kaldwin.
According to Bethesda, Death of the Outsider will be set after the events of Dishonored 2 and will see Billie freeing her old master Daud from a prison so that they can embark on one final mission: kill the enigmatic being known as The Outsider, the same being who gifted Daud, Corvo, and Emilie with their supernatural powers. The below cinematic trailer doesn’t include any gameplay, but it does confirm that actors Rosario Dawson and Michael Madsen will be reprising their respective roles of Billie and Daud. It is assumed that the game will use a similar dual protagonist mechanic as Dishonored 2, allowing players to choose between Billie and Daud and utilize each character’s unique abilities.
Dishonored: Death of the Outsider is set to launch on September 15 at a $29.99 price point. It will be available on Xbox One, PlayStation 4, and PC.