In the trailer, it shows the Hulk battling what appear to be Iron Man in his Hulkbuster armor. Is he actually in the armor (his own armor inside of the Hulkbuster) or is Ultron controlling the armor to battle the Hulk?
Trailer is here:
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The 2015 Disney Shareholder meeting was recently held, and this scene was shown. The scene is described as:
The scene opens with an armored police vehicle arriving on the scene. An incredibly angry and destructive Hulk is witnessed tearing up the streets, destroying cars and spreading all-out panic. Police, heavily armed with machine guns, openly fire on the Hulk to no avail. In the distance comes Iron Man, flying at super speed to the scene. "Hold your fire," he commands to the responding teams below. He is flanked by large metal objects that speed along through the air with him, keeping up every step of the way. We cut back to the menacing Hulk and all of a sudden, a large steel (?) surfboard-shaped object slams itself down in the pavement in front of him. Then another. And another. Before you know it, Hulk is trapped inside a giant, solid metallic "box." At least, that is, until Hulk smashes free and then continues his rampage. And then, it assembles -- piece by piece -- the Hulkbuster, almost in Mark 42 fashion. "The witch is messing with your brain," Stark tells Hulk. "You’re smarter than her, you’re Bruce Banner." This yields an even angrier response from Hulk and it’s on. Hulkbuster vs. Hulk. The Hulkbuster usually seems to have the upper-hand, as they drag each other through the streets, tearing up the pavement. At least until Hulk ends up on the Hulkbuster’s back, impaling the shoulder with a traffic light pole. "Dick move, Banner" responds Stark as they continue to fight.
(Read the rest of the description at the link at your own spoiler-peril)
Part of this scene, including verification of much of the description was confirmed with the release of this 90 second clip which was shown during the 2015 MTV Movie Awards.