I think we should stick to the official lore and don't get scared.
Grugni is concocting something in an underground fortress in Chamon.
Could be a new bloodline, some sort of invention, mecha-cogfort, new duardin empire, maybe summoning Valaya here.
What if we get some sort of Adeptus Mecanicus updates? Instead of miners a mechaMole team, some brass golem a la d&d that absorb magic and hit like a truck.. 😇
GW placed some lore seed that point in a clear direction, some sort of AoS-fication of the old dwarf line. We only need to wait!