Avengers: Infinity War (or whatever it winds up being called) will be "all hands on deck" for Marvel's cinematic heroes, according to screenwriters Christopher Markus and Stephen McFeely.
“It’s probably all hands on deck,” Markus told the L.A. Times when asked if Nick Fury would appear in Infinity War. “Don’t you assume you’ll see everybody in the Infinity Wars?” echoed McFeely.
This seems to confirm the longstanding rumor that the pair of Avengers films that were, until recently, known as Infinity War Parts One and Two, will incorporate as many Marvel heroes as possible. Whether this means outliers like the Guardians of the Galaxy or the Netflix heroes like Daredevil and Jessica Jones will get to join the party remains to be seen, but it stands to reason that at least the Guardians will show up, given their proximity to Thanos and the Infinity Stones.
As for where Nick Fury was in Captain America: Civil War, Markus says they "called, but he let the line blink".
“Primarily it felt like one too many possible opinions,” he explained, as to why he wasn’t included in the script. “We didn't want him to take one side or the other, because that's not his place in the universe. And then we didn't want another, ‘Is he still with the government? Is he opposed to the government but supporting the government?’ It got to be the potential for a lot more polemic discussion that the movie did not have room for.”
“He's the guy who put it together,” Markus continued. “He's been the sort of parent figure to the Avengers. Let the parent go away, and see if the kids can handle this. See if the kids can be who they're supposed to be without that governing voice. Um... and they didn't do that good of a job.”
Avengers: Infinity War Part One is scheduled to hit theaters May 4, 2018, to be followed by Part Two on May 3, 2019.