Following the success of "Spider-Man: Into the Spider-Verse" (which won an Oscar for Best Animated Feature, a category that's typically dominated by Disney and Pixar), Sony invested heavily in development of "Spider-Verse" sequels and spin-offs.
After a cute little "date" between Miles and Spider-Gwen, the "Spider-Man: Across the Spider-Verse (Part One)" trailer sends Miles spinning through the multiverse — where eventually he runs into Miguel O'Hara, aka Spider-Man 2099.