From PlayStation Universe: “Just over a month after the release of the games free Tokyo DLC, Saber Interactive and Mad Dog Games have announced that World War Z The Six Skulls Update will release next week on PS4, Xbox One, and PC via the Epic Games store.
The main component of the forthcoming update is the introduction of a brand-new extreme difficulty level: Six Skulls. Providing a fresh challenge for those who find insane difficulty a little too straightforward.”
Source: N4G PC World War Z The Six Skulls Update Arrives Next Week