I have no idea how legit r/GamingLeaksAndRumours is, but apparently this guy has correctly leaked stuff before and is taken seriously enough. The relevant quote:
Link
Personally I'm hoping this is true. A reveal this year would be in-line with Mankind Divided's 2015 reveal, about four years after Human Revolution's 2011 launch.
Deus Ex will return back for the next gen, Square Enix has been working on a sequel to Mankind Dividend....An announcement or teaser is coming soon
Link
Personally I'm hoping this is true. A reveal this year would be in-line with Mankind Divided's 2015 reveal, about four years after Human Revolution's 2011 launch.