A couple weeks ago, I had said to expect some kind of announcement on November 30th.
Bashiok has recently sent a new Tweet semi-confirming that something will be announced today. Many users are expecting an imminent release date to be announced, but I think it's more of a troll by Blizzard. :)
It's certainly dramatic, but don't get too hyped up. When you say something like, "The Heavens Shall Tremble", that's a pretty huge deal and it means that something really really really really huge is coming. It was also the phrase used in the original Diablo 3 teaser/reveal. It's not a phrase one would just throw around, so it SHOULD be a big announcement.. but, it will probably be various Diablo related information releases, game details, beta keys, Book of Cain information, more street art, Diablo in-game vanity pets, or any of the other possible stuff that I had previously mentioned.
It's certainly being hyped up like it's going to be a release announcement, but prepare for huge disappointment.
Yesterday, the Blizzard store and D3 NA/EU websites underwent some unscheduled maintenance as well. It would be nice to have the Digital Download available, but the release date will be announced before that ever happens.
Strangely, it seems that Diablo's 15th Anniversary might have moved from November 30 to some another date now. For a long time, the Diablo 1 release date was always recognized as November 30. However, it seems to have been moved to December 31st, or maybe January 2, or maybe January 7th. Some sources even have the PC release in 1998. Blizzard also removed previous mentions of the Anniversary Date from their website. :)
I'm going to have to go dig through some old magazines to see when it really came out. Either way, prepare to be trolled by Blizzard today. :)
* Update:
Well, whatever the Anniversary Date really is, expect another announcement on that day too.
The November 1996 issue of PC Gamer had a Diablo review and they said that it was "AVAILABLE NOW" for Windows 95.
Blizzard announced Diablo 1's release on January 3, 1997. Either it was a late response, or retail stores broke the street date on Dec 31st, making that the "official" anniversary date instead. :)
I also discovered Blizzard's early attempts at vanity figures: "BLIZZARD ANNOUNCES OVER 13 MILLION GAMES (played over Battle.net)". Forum users (even now) were taking about this really old announcement and are claiming that Diablo 1 sold "13 million copies."
They didn't read the fine print though, it was 750,000 copies "sold-through" worldwide. It's scary to see how easily they were influenced even now by something so blatantly obvious. Blizzard has gotten even better with their wording since then. :)
* UPDATE:
The D3 website has been updated to announce the new "J!NX Holiday Line". They claimed that "The Burnings [sic] Hells have been unleashed, and the world of Sanctuary requires your aide, brave adventurer." Weren't the Burning Hells already released though.. in the form of street art?
Anyways, I really hope this wasn't their troll attempt. They can do still much better.
* UPDATE:
They did much better, it was a giant troll for the new and improved Diablo intro cinematic v3. It's going to have 17.2 seconds more footage than all of the others that we have already seen! Can't wait!
* UPDATE:
Matais pulled one of the files from the original Diablo 1 disc.
Guess what? It's dated "November 30, 1996". :)
So the game was completed and out (gold) by November 30, 1996 and it hit stores by December 31, 1996. I don't know.. which one would you consider it's real anniversary?