I'd love to see this happening, and those massive Varghulfs rampaging battlefieldIn the reign of Sigmar they began the process of shifting from a bronze age to an iron age society. That was 2500 years before the present where they have some prototype steam driven land ironclads, revolvers, and clockwork horses. Dwarfs currently use breech loading rifled artillery and breech loading rifles in their steam driven ironclads where in more traditional times they use torsion engines like scorpions and onagers. Skaven possess Gatling guns, flamethrowers, and lightning guns.
Basically Dwarf and Skaven Engineers are roughly 19th century technologically. Imperials are probably more like 17th century because the Dwarfs don't share their secrets. Everyone else is more medieval. Ogres have artillery but their weapons are acquired from the Orient or Dwarfs rather than made for the most part.
Technology advancement could definitely be a factor. Although I think he was referring to the differences between say Tomb Kings and Imperials. The former being a traditional ancient army albeit with legions of skeletons led by mummified pharaohs and their immortal priests while the latter are aforementioned as 16th to 17th century with a touch of steam and clockwork fantasy.
I look forward in particular to seeing how they address naval warfare. There's enough official information to give inspiration without having to conform too heavily to existing material.
Monsters that can fight on land or in the sea or in the air or on the ground would be excellent. Dark Elf Hydras and Charybdis and High Elf Merwyrms fighting in the sea would be awesome as Dragons battle for the skies.
We know they can make infantry, cavalry, and artillery. The question is can they make monsters and magic that feels like more than a re-skinned elephant or artillery piece. If not I for one will be disappointed.Spoiler Alert, click show to read:
As for Navy it would be interesting, Norsca/Chaos would use Longships, Dark Elves with their fleet is already presented, and Empire (pictures below)
please use spoilers for large pictures