According to ComicBook.com on Sunday, during an interview with "Avengers: Age of Ultron's" Joss Whedon and Marvel Studios president Kevin Feige, they had teased information regarding the artwork entailing the battle between Tony Stark's Hulkbuster suit and The Incredible Hulk. The artwork currently portrays what looks to be Tony Stark in his equipped and highly recognizable Hulkbuster armor in fisticuffs with Bruce Banner's The Incredible Hulk.
There's some dust thrown about in the artwork as they appear to be both holding their own. Both Feige and Whedon speak rather cryptically and coy about the situation.
Whedon emphasize there is a relationship between Tony Stark and Bruce Banner that makes a major emphasis on how the story will come to a head. He found it interesting how the frequently and subtly shown inference to them battling out rather intriguing. It's rather known in the comic book world that the suit itself was used to take on the Hulk should he "act up" and be overly destructive. One could draw this as being analogous to Superman's battle with General Zod in Zack Snyder's "Man of Steel' movie.
Feige had this to mention:
"It's a bespoke suit. The back-up plan in case things go awry."
This statement does seem infer the above mentioned "hulk being a nuisance" situation, but one can only speculate. Also, Whedon acknowledged that this was after his time and considering that they are pals, he figures it would be interesting what it would mean in the movie considering that no one can really take on the Hulk.
"The Hulkbuster is from after my time [as a reader], but even I knew what a big deal it was. It makes sense because there's no one who can really go up against Hulk, but more importantly, those guys are best friends, so what that battle is and what it means is fascinating to me."
Whedon's "Avengers: Age of Ultron" is scheduled to be released in theaters come May 1, 2015.