The first Public Test Realm for Diablo 4 is now live, and many players are itching to get their hands on the new content and systems. However, there is yet to be a reveal of Season 4's theme — and there won't be on the PTR itself, according to Blizzard.
Diablo 4 PTR Patch 1.4.0 Patch Notes Now Available Diablo 4 PTR Now Live
Associate Game Director Joe Piepiora responded to player questions about the Season 4 reveal and that it will not be made known until some time after the PTR goes down. Piepiora went on to add context to the matter in another reply, suggesting that the PTR is squarely focused on huge amount of systems and itemization changes coming to the game. This is fairly understandable considering the scope of Patch 1.4.0. Adding the seasonal content on top of that would split the focus of not only the developers, but the playerbase engaging in the PTR for testing and feedback as well.
But the question at this point is: when will the Season 4 reveal be? Diablo 4's 4th Season is confirmed to start on May 14th, and the PTR ends on April 9th. This leaves 35 days between the end of the PTR and the start of Season 4. If Blizzard gives at least a week for the final Patch Notes to be public and some time to prepare after the PTR ends, we could potentially expect the Season 4 reveal to be somewhere near April 30th.
However, we do have one slight hint as to what the Season 4 theme could be. During the PTR, this placeholder Season banner was discovered:
While this could be easily and most likely be a placeholder name for the Season, the huge reworks to itemization and loot overall does at least lend some credibility towards the general theme the season might be going for.