Call of Duty: Infinite Warfare may have just been leaked due to a listing on the PSN.
No facts have been verified by Infinity Ward, but the likelihood of this being true is pretty high considering the leak came from the PlayStation Store. The PlayStation Store has been responsible for a few leaks in the past via this same accidental reveal. The most recent of which was Nathan Drake Collection last year.
If this leak is true, it denounced the former rumor that the next Call of Duty was going to be a sequel to the 2013 Call of Duty: Ghosts and is likely to be officially revealed within the next couple weeks. Call of Duty has a trend of being revealed during the NBA playoffs.
Until that reveal happens, we can only speculate as to the setting or plot of the game. Since the last few games have been inching more towards a full-blown sci-fi setting, I, personally, think that this will be the Call of Duty: Lasers & Robots we all knew would happen.