Spider-Man: Brand New Day, the 38th film in the Marvel Cinematic Universe, follows the franchise tradition of ending with a scene that hints at what's next for its hero. According to Kotaku, the film contains only one post-credits scene, placed at the very end, with nothing shown at the mid-credits mark.
In that scene, no characters appear on screen. Instead, viewers see the Spidey Tracker app that Peter's best friend Ned has built throughout the movie to log Spider-Man sightings around New York City. The app activates for a new sighting, but this time it isn't in the city — or even on Earth. The scene closes with Marvel's familiar 'Spider-Man Will Return' text.
Kotaku notes that, taken on its own, the scene is puzzling, since the movie gives no explanation for why Peter would leave Earth. The outlet suggests this is likely a setup for Avengers: Secret Wars, since Tom Holland has not been confirmed among the cast returning for the upcoming Doomsday film. In the comics, Secret Wars centers on Doctor Doom — played by Robert Downey Jr. in the films — deconstructing and rebuilding the multiverse into a single planet called Battleworld, which could explain why Spider-Man might appear to have left Earth if the films follow that story.
Kotaku also points out an apparent inconsistency: Brand New Day establishes that Spider-Man has some connection to the New Avengers through his meeting with Yelena, the new Black Widow, making it notable that he is reportedly not involved in the fight against Doom in Doomsday. Some fans have speculated that trailers for that film may have edited certain heroes out to preserve secrecy.
As of now, it remains unconfirmed whether Holland will officially reprise the role in a future film. Kotaku states that audiences will learn more about whether Doomsday addresses Spider-Man's absence when the movie reaches theaters on December 18.
A companion article from IGN was intended to explore what the post-credits scene means for Peter Parker's future, but the source page could not be accessed, so no additional details from that outlet are included here.