I think this is just Naughty Dog saying that they have their goals and the whole series still has a long way to go in order for them to get it where they want. People are assuming that this will be the last Uncharted game in the series, I don't think there's really any concrete evidence for that. Just because this game is called "A Thief's End" that doesn't mean Drake is the "Thief" in the title, it could easily be about Sully, a story about the end of Francis's journey or some nemesis of Nathan's.
It doesn't even have to be about death of anyone, it could be the end of Nathan Drake as a treasure hunter, but future games could introduce his Son or a Daughter and Nate could evolve into a more Sully like father or uncle figure.
IMO Uncharted 4 will definitely be out next year some time, because Naughty Dog hasn't said otherwise, it's taken longer than any past game in the series to release and all of the games from Uncharted 1 to 3 were developed for much more difficult to work on hardware than PS4.
Seems like any chance that the haters can get to downplay one of the biggest franchises in gaming and they latch onto that, because it's an exclusive on Playstation. The title of this thread needs to be altered, because it's false advertizing.
