The Russos Call Bucky & Cap's Relationship the Heart of "Captain America: Civil War" & More

It's official: "Captain America: Civil War" is a wrap. Co-directors Joe and Anthony Russo confirmed as much during a Q&A on their Facebook page, during which they called Bucky and Cap's relationship the heart of the film, revealed that there would be a surprising kiss and more.

When it came to choosing sides for the characters, Anthony Russo revealed that the process took quite some time. "We spent months and months and months when we were developing the film in a room with [Christopher] Markus and [Stephen] McFeely, the writers and the producers at Marvel, just talking over and over again what the various combinations could be," he explained. "Like, who would go where, what their motivations were, what the most fun things to do [are] -- how could we surprise ourselves? How could we surprise the audience by which side people would choose? It was a really involved process that was a lot of fun because we got to explore the characters on a lot of levels."

RELATED: New "Captain America" Trailer Explores the Road to "Civil War"

Bucky Barnes' characterization was another laborious process in the writing room. "This is another time we spent a long time thinking about and talking about with the writers, who have written all three 'Captain America' movies... they have a tremendous understanding of the character, the Winter Soldier," Anthony Russo shared.

"Here's the fun thing about him in this movie to us: he isn't Bucky Barnes from the first movie. He isn't the Winter Soldier from the second movie. He's a completely different version of that character," he continued. "Maybe, perhaps, it's a hybrid between the two in some way. How do you go from being a normal person to being a mind-controlled assassin to some life beyond that? That's what we're exploring in this film, is where this character is left on a psychological level and how can Cap reconnect with that person in any way after he's had this experience as the Winter Solider. That's at the heart of this movie -- who is Bucky, and can Cap ever have a relationship with him again?"

When asked if he could describe the ending of "Captain America: Civil War" in one word, Joe Russo said, "Yes, the one word I would use for the ending is 'complicated.'"

As to whether or not there will be some romance in the film, Joe Russo said, "I say we plead the fifth on that one."

Anthony Russo was a little more forthcoming: "There may be a kiss in 'Civil War.'"

"There might not be," Joe added.

"But I guess you can't guess which characters it's between," Anthony concluded.

Posted by The Russo Brothers on Wednesday, April 6, 2016

Additionally, Marvel released a new behind-the-scenes featurette for the film, during which star Chris Evans praised the Russos' filmmaking talents: "The Russos... make human stories with a superhero feel, as opposed to a superhero movie with human touches. It's not villain verses heroes. It's friends! It's family! That's what makes it such a good conflict."

"We needed to go in a radical direction if we were going to do another 'Captain America' film, so we were strongly advocating for the 'Civil War' storyline," Joe Russo explained.

"But we wanted everybody to be both protagonists and antagonists," Anthony Russo added.

Directed by Joe and Anthony Russo and starring Chris Evans, Robert Downey Jr., Scarlett Johansson, Anthony Mackie, Sebastian Stan and more, "Captain America: Civil War" opens on May 6, 2016.

Disney-Fox Deal Expected to Close in March

More in Movies