The theory about The Phantom Pain and Metal gear Solid Ground Zeroes being one and the same thing seems ever more likely. Many pieces of evidence have already been pointed out over the last few days, but here’s another one that’s particularly striking. Take a look at this screen from the trailer of Phantom Pain:
The text on the suits says: Combat Body Armor.
A close up of the text on the far right of the above screen.
Now, take a look at this screen from the Ground Zeroes trailer:
And here is a close up of the one on the left:
The lines of text above and below the ‘Combat Body Armor’ are hard to make out, but when compared to this one the similarity is striking:
(This one is taken from the soldier’s arm on the first screen, and flipped)