Dead Rising 4 was launched on Win 10 and Xbox One the last Christmas. Frank West installed his game on Steam in March and PS4 users could enjoy the gratuity and the excess of Dead Rising 4 in October.

EsteLacnejsie (Slovakian shop) listed the game for PS4 and included the date with it:

DR 4 [Rumor] Dead Rising 4 available for PS4 in October | VGLeaks 2.0

GameSpot published an article about the exclusive treatment of Dead Rising 4 the last year and the points exposed on the mentioned text could match with this release date.

Thanks, Jamal Jaroq (via Twitter).