If the Horns of Hashut are the direction the AOS Chaos Dwarfs will be going in, then I thier design will be leaning into a more industrial/ West Asian style rather then the fire, Babylonian and corrupted dwarf style from the Old world.
Having a load of fire motifs would mean they class to much and almost visually become a dark version of the Fyreslayers, which unless thats the direction GW want to take them, from a marketing and "casual entry player" perspective they clash too much. Hopefully they keep the old theme, where you take a smaller force of Chaos dwarfs and loads of worthless hobgrots chaff.
That would allow to play a small elite army of just dwarfs, a mix of dwarfs and hobgrot servants or a massive swarm of chaff whos job it is to die whilst the elite artillery and weapons tae out the big threats.
Imo if its the like the first Lumineth release, they will get 4 heroes, a battleline dwarfs unit, hobgrot chaff, an arty peice, some elite heavy infantry and a centrepeice unit. The rest would come out a year or two later.