Recall that The Tessaract being colour blue represents the Blue infinity stone that controls the mind as demonstrated by Tom Hiddleston (Loki) in the first installation of the movie. Giving the fact that they are in a way building up to a show-down with Thanos even though we don't exactly know when that will be happening but this movie should give us an idea, I think.
And for those of you out there who do not know who The Vision is, here is a little bio about him:
The Vision is an android created by Ultron (The Artificial Intelligence created by Tony) to battle the reunited Avengers team.
What do you think of the poster?