PlayStation Showcase announced for May 24 (Over an hour long, focusing on PS5 and PSVR2 games)

[The Fury]

Leynos said:

Splatoon has been done before Splatoon. Color Wars on Xbox 360. A china Mobile game tried to literally be splatoon. Ninjala was trying to be the next Splatoon but F2P on Switch.

So... done and succeed? Time will tell on SquEnix then.