Marvel Studios has shared a video announcing that Avengers: Infinity War has started filming. The first day of shooting was January 23, 2017. In it, we learn just a bit about the upcoming film such as Captain America: Civil War was designed to set up Infinity War and that at the end of Infinity War the Avengers will meet the Guardians of the Galaxy.
In addition to the announcement video, Robert Downey Jr went on Facebook Live from the set of the film. In the video we see directors Anthony and Joe Russo as well as Chris Pratt and Tom Holland who confirms that Spider-Man will be in the film.