While it has not always been clear, the Call of Duty Modern Warfare games all happens in the same Universe except for Ghost and Advanced Warfare. Some fans thought that the new Infinite Warfare might also be getting a world of its own but that is not the case it seems.
The new poster from the upcoming Call of Duty Infinite Warfare seems to suggest that the game will be set in the same world as Modern Warfare. While some fans seem to be okay with the news, others are not.
It looks like the biggest concern the fans have right now is that the Infinite Warfare world ruined the whole Modern Warfare series just by sharing the same world however, others think that Activision might have set the game in the same world just as an Easter Egg.
In fact, many believe that the Infinite Warfare story will be an independent story and will never effect the Modern Warfare story.