Sure enough, it wasn’tDiablo 4, but a mobile game calledDiablo Immortal.
Blizzard’s warnings didn’t stop the developers from being booed on stage at Blizzcon, which seemed harsh.
To me, the more casual fan, Immortal coming to PC seems like a good thing.

Diablo Immortal is therefore free to be its own thing, surely.
More recently, Lost Ark was likewise very popular for about 15 minutes.
Blizzard say they’ve made changes to support PC players, including adding more control options.

TheirFAQalso says that progress will carry over from the open beta to the full game.