Ahead of BlizzCon 2018, Blizzard published a blog in which they attempted to temper the expectations of fans who had speculated that a Diablo 4 announcement could be part of the event. However a report from Kotaku later suggested that Blizzard apparently had planned Diablo 4 to be announced, but pulled it at the last minute.
However it turns out that it might not have been true after all. Blizzard has since responded to the rumors in which they deny that Diablo 4 was part of BlizzCon 2018 and that they had pulled the announcement at the very last minute. This was confirmed by Blizzard co-founder Allen Adham.
According to Adham, “First off we want to mention that we definitely hear our community. We generally don’t comment on rumors or speculation, but we can say that we didn’t pull any announcements from BlizzCon this year or have plans for other announcements. We do continue to have different teams working on multiple unannounced Diablo projects, and we look forward to announcing when the time is right.”
That being said, Kotaku for the most part stands by part of its report, in which they assert that they can “confirm” that a Diablo 4 announcement video had been made, but whether or not it was planned for a BlizzCon 2018 announcement to begin with is unclear, although based on Adham’s statement, that was never the company’s plan.