A/N: there had been rumors about a Captain Marvel stand in that was in a Deleted scene to Age of Ultron. And today, an image of the stand in for captain marvel had recently been revealed via Reddit since the release of the infinity saga boxset.
(I cannot find the information on who the person is that they got for the stand in)
Apparently, The idea to introduce Captain Marvel in Age of Ultron came from director Joss Whedon. However, Kevin Fegie nixed the idea.