"I am not in Black Panther." Stan revealed, in the video above, before slipping into an impression of Bill Clinton. "I did not have any relation with Black Panther."
Don Cheadle has also confirmed that War Machine will recover from his injuries in Civil War and get back up:
"No, I'm not. I really am not [in Black Panther]." Stan explained. "But that [plotline] gets resolved in [Infinity War]."
Mark Ruffalo then told Fandango, that Hulk will have a major arc through Avengers: Infinity War and Avengers 4:
"Obviously at the end of Civil War, with what happened with War Machine, Rhodey's character has a lot to overcome. There's a progression to the movies, without being specific and telling you what it is, there's a progression and he gets back up."
"There's a huge change for Banner and for Hulk. It isn't resolved in the first Infinity War, it sort of culminates into the second Infinity War. Thor 3 is the beginning of a lot of changes for Banner and for Hulk."
Spider-Man and Doctor Strange will team up in Infinity War according to Joe Russo:
“There’s a really great chemistry there,” Russo said to Good Morning America at Disney’s D23 Expo. “They both have a proximity to each other, if that’s a hint that I can give. But anybody who’s a Marvel fan will know that they both reside in the same city. I think Tom [Holland] and Benedict [Cumberbatch] have a really wonderful chemistry and we wanted to exploit that.”