Spider-Man's debut in the upcoming Captain America: Civil War has been rumored / more or less assumed for some time, and now it seems Robert Downey Jr. has all but confirmed it. Speaking to Entertainment Weekly, the man more prominently known as Iron Man offhandedly noted Spidey's presence on set: "[Don Cheadle and I] are now like the old guard, and our storyline carries real weight just because of our history in the [canon]. But we’re also looking around like, ‘Who thought that Falcon and Black Panther and Ant-Man and now Spider-Man…?’" The article goes on to mention other clues to his presence, including a stuntman wearing a familiar red-and-blue costume.
As part of its surprise deal with Sony, Marvel confirmed that Spider-Man would first premiere in one of its own titles before a stand-alone film slated for July 2017. That narrowed the window to three films: Civil War, Doctor Strange, and Guardians of the Galaxy. Given Spider-Man's prominence in the comic book series that inspired Civil War, and the casting of Tom Holland during Captain America's production, it seemed like a no-brainer. Still, Marvel has been mum about any official confirmation.
Chris Evans, Captain America himself, found a way to temper expectations, telling EW, "You never know with Marvel. Sometimes they shoot things and then don’t use them." Sure. Maybe. Okay.
Verge Video: The Marvel Cinematic Universe explained in 13 minutes