An upcoming art book has mentioned that it covers imagery from several games from the franchise - and it also happens to mention a fourth game.
The new art book was Robert Brooks of Blizzard and freelance writer Jake Gerli, who worked on Diablo III: Cain's book, The Art of the Blizzard and The Art of World of Warcraft: The anger of the Lich King.
The good news is that this year could be the year that Diablo 4 is finally, officially unveiled.
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Thetweet was quickly targeted by an onslaught of China troll attacks and Morey soon deleted it. And I believe nobody stopped and considered what would happen.
Firstly, this book is so new that the ISBN number doesn't yet pop up in any publicly-searchable databases. Which would be flawless timing for fans interested in anything related to a Diablo 4 announcement.
Diablo IV was also a very expected title to be announced during last year's Blizzcon, which could also be credited for the backlash and criticism that Diablo Immortal, tha was announced instead, received. However, with Blizzcon coming up the first weekend in November, one of Blizzard's announcements may have been leaked early. The publisher could also use a public relations boost, and a Diablo IV announcement might help.
As we get closer and closer to BlizzCon - the huge annual party organized by Blizzard where she announces plans for the year - rumors are starting to become interesting.
Even before the entire #BoycottBlizzard fiasco kicked off as a result of the company seemingly shutting down gamers for supporting the Hong Kong protests, there was a lot riding on this year's BlizzCon - especially after last year's disastrous unveiling of a Diablo smartphone game.