Blizzard made a huge blunder during BlizzCon 2019 when it announced Diablo Immortal, a video game dedicated exclusively for smartphones and tablets. Many fans were present at the event were disappointed by the fact that Blizzard didn’t focus on the development of a proper sequel for Diablo 3 and decided to join the mobile gaming bandwagon.
According to a reliable source, it seems that Blizzard plans to release a new Diablo art book after the upcoming BlizzCon, and it seems that the advertising for the book mentions that it will feature artwork from Diablo, Diablo II, Diablo III, and Diablo IV.
Many thought that Blizzard would announce Diablo IV in 2018, but it is thought that Blizzard decided to delay the announcements due to some development issues. It is likely that if Diablo 4 was announced at the same time as Diablo Immortal fans would have reacted differently.
Another source claims that Diablo 4 and a remastered version of Diablo 2 will be announced at BlizzCon. It seems that fans are very enthusiastic about Warcraft 3 Reforged, and Blizzard decided to take the same approach with Diablo II, instead of releasing an updated version via GoG, as it did with Diablo.
It is important to take into account the fact that in most cases, Blizzard likes to spend a lot of time on the development process, to deliver a polished experience. Diablo III arrived after 12 years since Diablo II: Lord of Destruction was released, and seven years have passed since Diablo III was released.
The rumor mill anticipated that Diablo IV would offer an open-world gameplay experience, with a focus on exploration and a global map filled with a variety of quests, collectibles, and dynamic events. It will retain the classic isometric look of the series, but it will offer single-player, co-op, and multiplayer content in the vein of an MMO.