Since Agents of S.H.I.E.L.D and the Avenger's Clark Gregg (Agent Phil Coulson) miraculously came back from the dead after seemingly being killed by Loki a lot of people have been speculating how and why he survived. One of the most popular theories was that he was in fact dead and this version we have is an android or LMD that will go on to become Vision.
Up until now this has been nothing but fanboy's claims. However Clark Gregg has retweeted a tweet by @jesse_hamm saying we should just skip to when Coulson on becomes Vision:
Is Gregg hinting to fans, stirring things up with fans or simply imagining filming with Monica Belluci? Until anything is announced your guess is as good as mine.