Task: Explanation
Input (English): 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. It was announced at the PlayStation Experience event in December 2016, and will serve as the sequel to 2013's "The Last of Us". Question: What game with Ellie as the main protagonist was announced at the PlayStation Experience event in December 2016? Answer: The Last of Us Part II
Output (English):  It was announced at the PlayStation Experience event in December 2016, and will serve as the sequel to 2013s The Last of Us.