While Spider-Man: Brand New Day story details are being kept under wraps, the plot will focus on Peter now being on his own after the events of Spider-Man: No Way Home, as no one remembers who he is anymore in the MCU. If the MCU intends to go deeper into the Spider-Man lore, having Black Cat show up in Peter's life would make way more sense here than it would have in Holland's original trilogy.
The Black Cat character is also more suitable to explore during Peter's life as a young adult vigilante rather than when he was in high school, which would make Spider-Man: Brand New Day the perfect timing for the character's debut. It's more believable that Sony Pictures and Marvel Studios hired Sink to play Black Cat rather than Mary Jane Watson, as there have been theories suggesting that the Stranger Things star is somehow replacing Zendaya's MJ, which would be a massive stretch for the MCU.
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