So with the new vote out for which set will replace the British Expeditionary Force, I'm going to explain why I chose the Classic Fantasy Dwarves and what I think they can come with.
But before I get to that, I need to get the obvious out of the way, the fact that Warhammer: The Old World will come around eventually and probably bring back a lot of old dwarf kits. There is also the problem of how the dwarves will stylistically fit with the halflings, goblins, ogres, and skeletons. So my proposed solution, to both give the dwarves a style that would fit with the rest of the classic fantasy range and keep the tradition of dwarves being more technologically advanced, is to give them a Byzantine/Varangian armor style.
An image I found on reddit real quick.
Now for weapons, naturally we'd have swords, axes, spears, bows, and crossbows, but also guns. The fantasy excuse would be that the Dwarves have found a way to make their Dwarven Fire (basically the Byzantine Greek Fire that was a proto-flamethrower) into a propellant to fire projectiles at enemies. One thing I would add as well would be big guns and crossbows that come with pavises.
These things above.
Hopefully this sounds like a good idea. I'd love to hear your thoughts on the idea.