Cuphead PS4 is mentioned in some listings of the PlayStation Store itself
Studio MDHR on Twitter: "Surprise!! Cuphead is coming to PlayStation 4 ... TODAY! That's right: you'll be able purchase the game starting today on the PlayStation Store. While you're here, please enjoy
Cuphead PS4 Release is Out Now via the PlayStation Store
Cuphead
CUPHEAD is Now available on PS4 | New Game on Playstation Store - YouTube
Cuphead PlayStation Store listing leaked - Gematsu