You might have noticed that ARK: Survival of the Fittest didn't launch as planed on PS4 last Tuesday. That's because Studio Wildcard delayed it without much fanfare.
They made the announcement in a undated update on the PlayStation Blog a few days ago. Apparently they want to turn their focus to the main game, ARK: Survival Evolved, so that it can be released as soon as possible. No new release date was given.