"Banner's been living in Stark Tower. They've been working side by side and Bruce has his own lab now. He's doing work that augments Tony's own, which could lead to an experiment going wrong..." Could this be part of the reason why we saw that battle between Hulk and the Hulkbuster in the trailer? We'll have to wait and see, but Bruce will be getting a lot closer to at least one of his fellow Avengers! "His relationship with Natasha deepens. There's something similar about the two of them. I see them as lost souls. They're kindred in some ways." Sounds good, but what's in store for the Hulk? Avengers: Age of Ultron is still shrouded in secrecy, but Mark Ruffalo offered up at least a few new details in a recent interview with Total Film Magazine . For a start, it appears as if Iron Man won't be the only one kicking himself for creation the sequel's titular villain!Could this be part of the reason why we saw that battle between Hulk and the Hulkbuster in the trailer? We'll have to wait and see, but Bruce will be getting a lot closer to at least one of his fellow Avengers!Sounds good, but what's in store for the Hulk?

"He does feel more comfortable with himself," the actor reveals. "His confidence is getting better. But, you know, that gets shaken. His ability to handle the Hulk really gets thrown into question in this film. The hard part is coming back. Hulk doesn't want to cede his place. It's much harder to come back from being Hulk than it is to get into him." That should be an interesting dynamic to see, and something which has been largely unexplored in previous movies featuring the Green Goliath. "I think there's a whole other chapter we haven't seen yet where you find the other nuances within him. The battle of identity going on between him and Banner is all about establishing dominance. The only thing that Hulk is really afraid of is Banner. That's an interesting dynamic." Oh, and for those of you worrying that Avengers: Age of Ultron will be too dark, Ruffalo promises: "What Joss is going after is really big. But there's still lots of laughs. There's some goofy stuff. I mean, it's Whedon!" What do you guys think about these latest details?