Y literalmente han confirmado plataformas. No van a sacar un juego para PS4 u One dos años después de que hayan salido PS5 y demás...
"Rather than follow the series’ usual straightforward level design, Diablo 4 will feature five big, contiguous regions—with a day-night cycle and dynamic weather system—the player can conceivably wander at their own discretion, assuming they have the gear to cut it. More important is the “shared” part of that description. We’ve yet to hear how many players will be wandering Diablo 4’s open world at once, but the point is they’ll be wandering with you.
Towns act as social hubs for chatting and grouping up, PvP zones act as seamless ganking areas, and world events spawn big monsters that strangers and teammates can take down together. The world is also apparently big enough to justify the addition of mounts. We’ll be able to suit up our horses in armor, perform powerful dismount abilities, and explore the open world at a brisk clip."