This little someting is about one of the best 'crying simulator' around, The Last of Us. Actually more like The Last of Us 2, hopefully. The Last of Us was a tremendous experience and we are waiting for a sequel since 2013. Can this Uncharted 4's easter egg be a hint for The Last of Us 2? Poster has a writing on it: The Last of Us: American Daughters. A woman wearing a gas mask, hopefully Ellie or could be Ellie's mother, Anna.
There is one more thing we should pay attention to. There is a The Dark Horse logo on the poster which means that the sequel maybe coming as a comic.
Maybe it is a hint, maybe it is not. But let us hope.