The Last of Us Part II is in the Works, According to Actor Nolan North

Nolan North, one of Naughty Dog's regular voice actors, revealed during Metrocon 2015 that they were already working on the sequel to The Last of Us.

The company neither confirms nor denies the news as they are focusing on the release of Uncharted 4, in which Nolan North ironically voices the protagonist, Nathan Drake. However, Naughty Dog had already hinted that they could continue with one of their successful franchises, and there is none better than The Last of Us.