Amazon always marks Dec 30 as the release date for games that have no release date yet. They do this all the time.

Crackdown: http://www.amazon.com/Crackdown-3-Xbox-One/dp/B00KVLZ00I/

Dishonored 2: http://www.amazon.com/Dishonored-II-Xbox-One/dp/B00ZM5ON88/

Mafia 3: http://www.amazon.com/Mafia-III-Xbox-One/dp/B013H0ISW6/

You get the point.