Based on the games' performance, we know that Naughty Dog will eventually have to pick up where we left off to continue the story of Ellie and perhaps Abby and Lev. The way Part II ended, it's only a matter of time before The Last of Us Part III happens.
With that said, we now have some new information regarding the third mainline title in the series. A reputable source has suggested that Naughty Dog is already working on The Last of Us Part III.
Twitter user ViewerAnon shared claims Part III is currently in production at Naughty Dog. "Well, I'm not watching anything, so... Dr. Uckmann's next game is THE LAST OF US PART III which is currently in production at Naughty Dog," the user tweets.
Dr. Uckmann" refers to The Last of Us game director Neil Druckmann. Doctor Uckmann is a trading card that can be found in The Last of Us Part II as an easter egg.
ViewerAnon previously leaked the details of the HBO adaptation of The Last of Us that have been proven true. The user correctly predicted actor Ashley Johnson will be playing Anna in the live-action adaptation. ViewerAnon also recently shared information Naughty Dog isn't working on the upcoming Uncharted reboot.