While exacts of the project never manifested, it's an interesting idea nonetheless. Soulslikes have never quite hit the pedigree offered by FromSoftware D2R ladder items, but Diablo is such an established franchise that the possibility of a lovechild between it and Dark Souls can definitely perk the ears. It's possible some take on this is in the works at Blizzard, that's if it didn't completely abandon the idea, but that is just speculation and is admittedly unlikely.
Trying to guess where it might have went, it's possible that Diablo 4's classes (the Barbarian, the Druid, and the Sorceress) could be manifested in such a game. This would likely combine Dark Souls-style gameplay and class approach, with Diablo 4 providing the overall flavor.
It's not hard to imagine approaching of one Dark Souls' notoriously difficult bosses, with the melee power of Diablo's Barbarian class, a unique tank build for the Druid, or the magical might of the Sorceress. It could have been a perfect pairing of power fantasy and involved, difficult, and punishing gameplay.
Ultimately, it seems unlikely that any semblance of Project Hades sees the light of day again. There's a ton of reasons that Diablo may want to stick to its ARPG path, and it can't be faulted for that d2r items for sale. Nonetheless, a Blizzard-led Dark Souls-esque project may just sound like a pipe dream for fans of both franchise.
