If they put in the Vision, don't they need to put in Scarlet Witch too?
I think there's some uncertainty about whether they have the rights to Wanda and Pietro, because they're the children of Magneto, whose movie rights are owned by Fox. I think I read something suggesting that maybe Marvel could use the characters if they didn't allude to their mutant nature or parentage, and Fox could use the characters as mutants if they didn't allude to their Avengers connections. Although that may have been just the article writer's best guess.
Corporate custody fight!
Who gets the kids? Would be funny if Disney and Fox came up with their own iterations of the characters..
Much as I like the Coulson-becomes-The Vision idea, I doubt they'll go heavy duty with the colorful costumed superheroes. It will probably be more like 24, with the knowledge that superheroes exist offscreen and a few onscreen appearances.