What does this concept art mean for the movie? Well hopefully Hulk will go into a rage after saving everyone from the unlimited power of villain Ultron. Hulk’s power too is unlimited but also doesn’t have a stop button, his rage fuels his power. The longer the fight goes on and the more angrier he gets, the more stronger he becomes.
It would be sense for the team to come up with a contingency plan and the Hulk Buster is the answer. I know Avengers 3 is already announced and Thanos is the Super Villain who holds all the infinity stones by then, but will we get the World War Hulk movie that fans have been waiting for? Maybe this concept art reflects what will happen at the end of Avengers 2 or 3, but one way or another we will find out.