Diablo 4 Season 15 & BlizzCon 2026: Everything We Know About New Features, Warlock, Reveals & More

Summary

Blizzard is taking an unusual approach with Diablo 4's Season 15. Instead of revealing all upcoming content in advance patch notes, the developer is intentionally keeping major features secret until BlizzCon 2026, which runs from September 12-13. Whether you're preparing for the new Soul Splinters, hunting for Legacy Uniques, or gearing up for the Warlock class, you can always buy Diablo IV Items from trusted platforms to give your character a head start before the new season drops. Here's everything we know about what's confirmed, what's been datamined, and what might still be coming.

What's Already Confirmed for Season 15

The 3.2.0 PTR (Public Test Realm) ran from August 4-11, giving players a first look at several confirmed systems.

Soul Splinters

A new socketable item type for jewelry slots. Each Soul Splinter offers powerful damage bonuses but comes with a significant drawback—for example, the Splinter of Anguish gives 35% Critical Strike Chance and Attack Speed but increases Primary Resource Costs by 30%. Other splinters include:

Legacy Uniques

Blizzard is bringing back reimagined versions of iconic items from Diablo 1, 2, and 3. The list includes:

All Classes:

Leoric's Crown (Helm) – boosts socketed gem effects

Nemesis Bracers (Gloves) – spawns Elites from shrines

Stone of Jordan (Ring) – classic from Diablo 2

Squirt's Blouse (Chest) – incorporates Squirt's Necklace power

Multiple Classes:

Arioc's Needle (2H Polearm) – Barbarian, Druid, Spiritborn

The Furnace (2H Mace) – Diablo 3 classic

Messerschmidt's Reaver (2H Axe) – from Diablo 2

In-Geom (1H Sword) – available to six classes including the new Warlock

Challenge Dungeons

Randomly spawning portals in the open world that lead to boss encounters. Blizzard has stated that the PTR version only tests "the underlying system," and the final Season 15 experience "will feature different content".

Overland Ambushes

While exploring, you may receive a warning that a powerful demon is hunting you—described as a "rare and difficult encounter".

Rebirth System

Returning from Diablo 3, this allows you to carry a seasonal character into the next season instead of starting from zero each time.

Mythic Crafting Changes

Based on community feedback, Mythic Unique items will be easier to craft and find. The rarest "Iconic Mythics" will now have weaker Unique versions available.

What's Being Hidden Until BlizzCon

Blizzard explicitly stated in the PTR announcement that Patch 3.2.0 "may contain features you are not familiar with" and that more will be shared at BlizzCon. This has sparked widespread speculation.

Moophisto – The Secret Cow Level Boss?

Dataminers have uncovered evidence of a world boss named Moophisto. This appears to be a demonic cow-like creature with wings, a cape, and a cowbell. A corresponding unique amulet called Moophisto's Bell has also been datamined. Given the long-running "Secret Cow Level" tradition in Diablo games, this could be a major BlizzCon reveal.

The Warlock Class – Officially Confirmed

Unlike the cow level speculation, the Warlock class is officially confirmed for the Lord of Hatred expansion. It was announced during the Diablo 30th Anniversary Spotlight in February 2026. Blizzard plans a dedicated Warlock spotlight event on March 5, 2026.

The Warlock will be added to:

Diablo IV (as the second new class in the Lord of Hatred expansion)

Diablo Immortal

Diablo II: Resurrected

Diablo IV game director Brent Gibson teased that players will "freak" when more details are revealed at BlizzCon 2026. The class follows the Paladin (added with the Lord of Hatred expansion) as the second new class, creating a light vs. dark thematic pairing.

New Expansion Speculation

While the Lord of Hatred expansion just launched in April 2026, some community speculation suggests Blizzard could announce the next expansion at BlizzCon. The next Prime Evil expected to appear is Baal, with a potential title of "Lord of Destruction". Possible new zones include:

Xiansai (never a playable zone in any Diablo game)

The Dreadlands

The ruins of Mount Arreat

Nintendo Switch 2 Version – Leaked but Unconfirmed

According to reliable leaker billbil-kun, a Diablo IV: Age of Hatred Collection for Nintendo Switch 2 will launch on September 15, 2026. This would include:

The base game

Vessel of Hatred expansion

Lord of Hatred expansion

Price is reportedly $69.99 / €69.99 / £62.99. Pre-orders may begin on September 12—the first day of BlizzCon 2026. The physical edition will contain a download code rather than a cartridge. Ratings board listings in both Indonesia and Taiwan have also pointed to this port.

What's Less Likely

Mercenary Gear Slots

Some players spotted the returning "Nemesis Bracers" and speculated this means mercenaries will finally equip gear. However, Blizzard has no announced plans to change the mercenary system.

Summary Table

With BlizzCon 2026 free to stream for all players, September 12-13 will be the moment we finally learn what Blizzard has been holding back. Given the secrecy and deliberate hype-building—including the game director's promise that fans will "freak" over the announcements—expectations are high for some major reveals. To prepare for whatever comes next, whether it's new class gear or upcoming expansion content, you can find cheap Diablo IV Items at MMOEXP, a reliable platform offering great deals and fast delivery to keep your character ready for action.