now I do not meen the paly style would be same whit long gcds and stuff, but an open world diablo game, that is more hack and slash still.
loot would work as in any diablo game, aka lots of it.
mobs would come in big groups, spawn quite fast, faster than in wow.
dungeons would be similar as in wow, but again work more like in any other diablo game offcourse, same whit raids though you would need more people to finish them offcourse.
classes should not be a problem realy, though most likely not as many as we have now, skills not sure about, maby something similar that in diablo 2.
so game would be open world, fast pased combat style, no idea if it would even be viable, just something I started to think of.