What game with Ellie as the main protagonist was announced at the PlayStation Experience event in December 2016?
Ellie (The Last of Us): Ellie is a fictional character in the 2013 video game "The Last of Us", and the main protagonist of the upcoming video game "The Last of Us Part II". The Last of Us Part II: The Last of Us Part II is an upcoming action-adventure survival horror video game developed by Naughty Dog and published by Sony Interactive Entertainment for PlayStation 4. The Last of Us Part II:  It was announced at the PlayStation Experience event in December 2016, and will serve as the sequel to 2013's "The Last of Us".
The Last of Us Part II