Short answer: No, it is not cancelled.
More robust answer: We showed some additional progress at BlizzCon this year, but largely let Diablo IV have the spotlight. There's a lot of Diablo to talk about, but we're trying to make sure each game has room to breathe and stand separately, which helps avoid confusion about each project.
Verifying this is accurate.
@vivithecutest Ah yes. Lut Gholein, the Jewel of the Desert. Perfectly understandable.