Abc's MARVEL: Assembling a Universe documentary, based on the Cinematic Universe of the beloved franchise, revealed some great memories of the past and what is to be future Marvel projects such as [Guardians of the Galaxy](movie:424073) and of course the Holy of Holy's: Age of Ultron. Although it was speculated that we may see some of the first footage of the upcoming Avengers flick, there was no such luck. However some interesting pieces of Concept Art were flashed suddenly on the screen revealing one image in particular when discussing the upcoming film. As you can see from the image above, Tony Stark's fan favorite Hulk Buster suit is revealed (which looks awesome btw) locking fists with none other than the Big Green Guy himself.
Although this is of course concept art, I believe because it was presented in the documentary that it does have some weight to the fact of it being very legitimate in [The Avengers: Age Of Ultron](movie:293035). This might just be me but the set design in the background of the picture looks very similar to that of the recent Johannesburg leak of a supposed Hulk head flipping a car in a suburban/city type area.