Actor Mark Ruffalo confirmed to Huffington Post that yes, he's going to be in Thor: Ragnarok, but couldn't say much else about it.
"I play Dr. Bruce Banner, and occasionally I turn into a big green, mean monster," Ruffalo joked to them. "I am excited to keep coming back to this role. I see a lot of space for it to grow."
One of the things he'd like to see? "The relationship between Banner and Hulk." In fact, he'd like it to go further than we've seen on-screen. "Hopefully, we'll see the two of them in a scene together. That would be cool!"
In the comics, Hulk and Banner have had conversations a few different ways, both in the landscape of their shared mind, but the crazier moments come when he's been separated from his big green half. In fact, in the animated movie Hulk vs. Thor, Loki separates the two, sending Hulk raging upon Asgard. Could this all be a hint into Hulk's use in Thor: Ragnarok? Craig Kyle and Christopher Yost wrote Hulk vs. Thor, and the pair are also writing Thor: Ragnarok.
Thor: Ragnarok is scheduled for a November 3, 2017 release.