From Spider-Man News:
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While answering a question about how the story will continue in future movies, Holland said: “It’s going to be an exciting couple of movies. Yeah, there’ll be Spider-Man 2 and 3”.
When the AlloCiné pointed out that Holland just broke some big news (only Spider-Man: Homecoming 2 has been announced so far), Holland quickly apologized to Marvel. “Well, now you know. Sorry Marvel. Whoops!,” he said.