It seems that during a recent interview with Finder.com, Naughty Dog had some interesting comments regarding how many games they are going to make for the PS4. It has taken a few years just to get the Uncharted game, which is set to release next year. It now looks that we're getting an additional game this console generation.
Finder asked this question to the Community Strategist of Naughty Dog:
"Will Naughty Dog’s next game make it in the current generation of consoles?"
"AM: I would hope so. I would hope we would release a game pretty soon. Yeah, our development cycles aren’t too long so and I have no idea how long this console generation really is going to last, but, yeah, there’s no doubt it should be in this console generation for sure."
Uncharted 4 looks to be the last game in the Uncharted series from Naughty Dog. We will update you if there's more development to this story.