Blizzard is working to innovate keeping the roots of Diablo with the fourth iteration. The game is in an advance state of development -at least for the Blizzard standards-. According to Windows Central Diablo 4 could be yours in April 2023 and the preorders will open in December.
Therefore, I suppose the game will be in The Game Awards to announce all the news about it.
If you do not know about this chapter in the Diablo saga, this video summarized the new elements included in the latest Blizzard’s title:
Thanks, Windows Central.