Today at Blizzcon, Blizzard teased an upcoming expansion to Diablo 4: Vessel of Hatred, which will include a brand new, never-seen-before in Diablo class. It's coming in late 2024.
We didn't get too many details about Vessel of Hatred beyond that, though we did learn it will take place in a region called Nahantu, and will concern the fate of Mephisto and his plans for Sanctuary.
There will be no salvation in the light.
The #VesselofHatred expansion comes to #DiabloIV in late 2024