The Last of Us: Part 3 Has a Plot, But It's Not Being Made... Yet - IGN
Naughty Dog has written a story outline for The Last of Us: Part 3, but it isn't making the sequel right now.
www.ign.com
Speaking on an episode of the Script Apart podcast about the writing of The Last of Us Part 2, Druckmann touched briefly on the possibility of a sequel:
"'I don't know how much I want to reveal... [co-writer Halley Gross] and I did write an outline for a story, that we're not making – but I hope one day can see the light of day – that explores a little bit what happens after this game. We'll see.'"