In their Second Quarter 2022 Financial Results report, Blizzard has confirmed that Diablo IV will release in 2023. Diablo IV will also officially support cross-play and cross-progression across PC and consoles.
Activision Blizzard Second Quarter 2022 Financial Results
As usual, the quarterly report provides details regarding the current and future development of Blizzard’s franchises, stating that Diablo IV is still slated for a 2023 release: