Since the first Avengers: Age of Ultron trailer, the biggest tease has been Iron Man’s enormous “Hulkbuster” suit and his very public fight with The Hulk.
from Pocket http://www.theverge.com/2014/10/24/7057313/hulkbuster-iron-man-vs-the-hulk-is-cool-and-poignant
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The Badlands and Everything After 