That makes this more than the usual convention schedule announcement. We already know quite a lot about Season 15 from the August PTR — Soul Splinters, Challenge Dungeons, Overland Ambushes, Legacy Uniques, Rebirth, Mythic changes and more — but our Season 15 PTR evaluation ended with one fairly large question mark: what exactly did Blizzard decide not to let us test? On September 13, we should finally begin getting the answer.
Diablo Gets Two Major Main Stage Slots
The official BlizzCon 2026 schedule puts Diablo: Developer Update on the Main Stage on Saturday, September 12. For European viewers, the presentation begins late in the evening at approximately 22:45 CEST and runs for 45 minutes. The broader Diablo title is worth noting: Blizzard has not labelled this specifically as a Diablo IV presentation, which leaves room for Diablo Immortal, Diablo II: Resurrected or wider franchise announcements alongside the current game.
Sunday is considerably less ambiguous. Diablo IV: What’s Next is scheduled for September 13 at approximately 20:00 CEST, again for 45 minutes on the Main Stage. When Blizzard puts the words “What’s Next” after a game title at BlizzCon, expectations have a habit of becoming unhealthy surprisingly quickly.
There are other Diablo-related sessions as well. Saturday includes The Art of Darkness: Behind Diablo IV’s Cinematics, while Sunday features a 30 Years of Battle.net presentation with special guest CD Projekt Red. That last one has suddenly become rather more interesting after Blizzard and CD Projekt Red described Geralt’s Diablo IV appearance as the beginning of a wider partnership and specifically promised more information at BlizzCon.
Season 15 Was Deliberately Kept Incomplete
The biggest known item on the agenda is Season 15. Before the 3.2.0 PTR even opened, Blizzard issued an unusually direct warning: the test would contain a different selection of features than players might normally expect because the developers had more to share at BlizzCon and did not want everything coming with Season 15 available beforehand.
That means the August PTR was never the complete season. Players tested Soul Splinters, Legacy Uniques, Mythic and Unique Charms, Rebirth, Challenge Dungeons and several underlying systems, but some of the actual seasonal content remains behind Blizzard's convention curtain.
We have already seen why that matters. Soul Splinters emerged as one of the PTR's more promising ideas, while Rebirth finally means players can stop recreating essentially the same character every season. Challenge Dungeons were deliberately tested using encounters that Blizzard says will differ from the final Season 15 content. We know quite a lot about the machinery. We still do not entirely know what Blizzard intends to build with it.
Could the Switch 2 Finally Appear?
There is also one enormous unconfirmed item hovering around the schedule. Diablo IV still has not been announced for Nintendo Switch 2 despite increasingly specific reports pointing toward a September release. We previously asked whether Blizzard was saving the Switch 2 announcement for BlizzCon after Diablo IV skipped Gamescom Opening Night Live.
A dedicated “What’s Next” presentation would certainly be an obvious place to reveal it. That does not make the port confirmed. Blizzard has announced nothing, and the September 15 release date circulating through leaks remains exactly that: a leak.
But if Blizzard really intends to launch Diablo IV on Nintendo's new hardware immediately after BlizzCon, the calendar is becoming rather suspicious.
Watching BlizzCon Also Gets You Three Diablo 4 Weapons
Players watching from home will also have something tangible to collect. Blizzard's official BlizzCon viewership guide lists three Diablo IV rewards available through Twitch and YouTube between September 12 and September 15. Watching for two hours awards the Serrated Skean dagger, four hours unlocks the Corroded Cleaver axe, and six hours provides the wonderfully named Tintinnabulation mace.
None of those are reasons to spend six hours staring at a livestream by themselves. Fortunately, Blizzard appears determined to provide considerably more interesting reasons.
September 13 Is Now the Date to Watch
For Diablo IV, the important thing about this schedule is not simply that the game has a panel. Blizzard has deliberately created unanswered questions before arriving at BlizzCon. Part of Season 15 remains hidden. The Witcher collaboration has more details coming. Switch 2 rumours are unresolved. And the company has reserved 45 minutes on its biggest stage for a presentation literally called “What’s Next.”
Sometimes convention panel titles are just panel titles.
This one has quite a lot of unfinished business attached to it.
Diablo IV: What’s Next begins Sunday, September 13. Sanctuary should look considerably less mysterious 45 minutes later.
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