Rumors surrounding the upcoming Avengers: Doomsday film suggest that it may include several new characters from the Marvel Cinematic Universe, with some outlets reporting that at least 8 new characters may be added to the cast. There is also speculation about potential casting choices and character appearances, including the possibility of a young avenger joining the movie. However, the exact details of the film's cast and plot remain unclear, with conflicting reports and unconfirmed rumors circulating.