Though the "Black Panther" film doesn't arrive until February 16, 2018, the character will appear in this May's "Captain America: Civil War." During an interview with io9, Marvel Studios president Kevin Feige revealed that "Black Panther" director Ryan Coogler stepped in to help screenwriters Chris Markus and Steve McFeely develop Black Panther as he would appear in "Civil War."
"Ryan [Coogler] came in and watched the movie," Feige shared. "We did a little bit of additional photography here and there and Ryan did a pass at a couple of those scenes. So there's a line or two that Panther says in the movie that Ryan contributed to. Chris [Markus] and Steve [McFeely] absorbed it into their draft, put their spin on it and words to it, but Ryan has started to be involved in earlier cuts of this movie."
Earlier today, Feige also revealed that Coogler is one of a "number of writers" currently drafting the film's script.
This isn't the first time in the history of the Marvel Cinematic Universe that a director has helped out on another film. "Avengers" director Joss Whedon also stepped in to help other films like "Thor: The Dark World" in order to make sure the events and characters lined up in the scheme of the larger MCU.