UPDATE 2: A Modern Warfare Trilogy has been spotted on Amazon. No further details on it yet. You can see it here

UPDATE: New leaked poster for Call of Duty: Infinite Warfare shows off Legacy Edition and confirms it will take place in space. As you can see he is holding a astronaut helmet. This also confirms the release date for the legacy edition and that it comes with CoD Modern Warfare remastered.
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The next name for Call of Duty that will be coming out this year may have been leaked on the PlayStation store. The PlayStation Store in NA on PS4 has received its weekly update, and there was a banner added called ‘Call of Duty: Infinite Warfare’.
No other details were said but we can most likely expect it to be called that unless this was a tease or photoshopped.
Source