The Black and Gold Suit
It’s brief, but the trailer does flash to a scene of Tom Holland’s Peter Parker running through a building in a black suit without a mask on. And it’s not the same one that made people call him Night Monkey in Far From Home, either.
It’s likely the new black and gold suit that’s been teased several times in toy promos. But if we really want to get crazy with theories, it could also be a symbiote-like suit similar to the one that Toby Maguire’s Peter had on in Spider-Man 3. There’s also a different shot (pictured above) later on that shows another black suit, seemingly without any gold on it.
It’s hard to tell, but that’s a much more fun theory to go with and it wouldn’t be completely impossible since Raimi trilogy villains are in the movie. Who’s to say that Topher Grace’s Venom, or at least the symbiote, can’t show up too? We might even get to see some meme-worthy dance moves from Holland if that’s the case.