I have a feeling that "The Phantom Pain" in some sort of way may in fact be a cover for 'MGS5'
here is a link: http://tmblr.co/Z2o2puYwL_Ie
one good thing to do is: go to Tumblr and type in metal gear solid 5
'flarevortex' on tumblr. He/she has a compairisons of 'Phantom Pain' and MGS
tumblr user 'lifezealot' has a cool gif