A new Deux Ex game as a next-gen launch title? That'll do nicely, thanks.
At this point that's pure conjecture, although CVG does report that Square Enix has trademarked the name Deux Ex: Human Defiance.
Narratively that would work very well as a sequel to 2011's DE: Human Revolution, in which there was a theme of public resistance to the growing climate of augmentation pushed upon the populace by corporations.
Whether a new title is in development and could possibly be a PS4 and Next Xbox launch title is nothing but guesswork. But we can dream.