https://blog.playstation.com/2020/06/18/marvels-spider-man-miles-morales-an-update-from-insomniac-games/ (https://blog.playstation.com/2020/06/18/marvels-spider-man-miles-morales-an-update-from-insomniac-games/)
Glad to see they formally addressed what this is:
"We know a lot of you want to know how big this game is. Our team at Insomniac has been working incredibly hard to bring you a fantastic Miles Morales adventure since we concluded development on Marvel's Spider-Man. You'll experience a full story arc with Miles, one that's more akin to a game like Uncharted: The Lost Legacy in terms of overall scope. Marvel's Spider-Man: Miles Morales is an important, heartfelt, emotional and essential experience to expanding the Marvel's Spider-Man universe. And we hope it will be for you as well.