I am... 60% sure we're getting an Astral Chain sequel on the Switch successor.
Platinum Games has done nothing outside of Bayonetta Origins, a vastly different game from their normal work with a bunch of different staff. Bayonetta 3 meanwhile is nearing 3 years of age, the same amount of time between Bayonetta 3 and Astral Chain and Astral Chain to Nier Automata. The most natural thing for Platinum to do would be to make Bayonetta 4,
but Kamiya, the main writer for that series has left and honestly Bayonetta 3 has burned any bridges for fans wanting a sequel.
Ergo, Platinum Games, after recently opening a new office building in Fuokaka, requires a new game that is guaranteed to be semi-popular, one where another company can publish and give them resources, and one that doesn't involve Kamiya who just left. Nintendo
simultaneously needs a big flashy game with safe sales to put in sizzle reel trailers and to market their shiny new console with.
AND, if there is a sequel and it IS popular, it is now a mainstay Nintendo series IP, making it a VERY plausible choice for Smash Bros.
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It all points to Astral Chain 2...