The official Japanese account for the game said on X, according to machine translation, that the release date in Japan “has not yet been decided,” without going into detail about the reason. It certainly seems like a reason could be the patent infringement lawsuit Nintendo and The Pokémon Company filed against Palworld developer Pocketpair last week,

Who’s ready to capture some Pokémon-looking creatures and force them into labor camps to manufacture assault rifles? As announced in the new State of Play, PlayStation 5 players can now join in the Palworld fun with a port out on Sony’s platform just a week after maker Pocketpair was sued by Nintendo for alleged patent infringement.

Palworld arriving today on PS5 was just announced at PlayStation's September State of Play, so you can stop asking for a that port.