http://www.eurogamer.net/articles/2017-06-21-naughty-dog-on-lost-legacy-and-the-future-of-uncharted
There are also several hundred people on Lost Legacy so TLOU 2 is going pretty slow:
And finally, they're interested in making open worlds:
Eurogamer: Does this mean Uncharted can carry on further without Nathan Drake? Do you consider this the end of its characters' stories?
Escayg: I wouldn't say it's the end. This thieving world is huge. There's so many characters. Even before we settled on this particular story we were exploring Sullivan, we were exploring Cutter, and pairing each other up, thinking what would be right, what would have conflict, growth, something new, something fresh. And Chloe was the one that kept jumping out.
But to say the Uncharted world is done... I doubt that highly.
There are also several hundred people on Lost Legacy so TLOU 2 is going pretty slow:
Eurogamer: Lost Legacy looks up to the quality fans now expect from Naughty Dog - but you guys are also working on The Last of Us 2. How many people are working on Lost Legacy now? How much of the studio?
Escayg: Right now, the studio's focus is Lost Legacy. We have a truly ambitious schedule. The Last of Us [project] is working but at a lot slower pace right now. The entire team is on Lost Legacy - that's a couple hundred of us strong.
And finally, they're interested in making open worlds:
Eurogamer: Naughty Dog has so far resisted the urge to make a fully open world game, despite industry trends. Would you ever venture into that territory, or is it a case of you guys sticking to what you're good at?
Escayg: The future is uncertain there - we're always testing it. There's a segment in Lost Legacy similar to [Uncharted 4's] Madagascar where you can choose to explore and see different areas at different times, experience it differently. When we find a way to do things in an open world I think we'll definitely venture there at some point.