Hints we already received about 9th Age fluff:
- more inspired from Earth's history than GW's WH 8th
- fits present unit's appearance.
Empire of Sonnstahl will be the most important human nation, located in the middle-north part of a continent resembling Europe, speaking a germanic tongue, at a stage of civilization equivalent to early Renaissance.
There will be Knightly Orders, infantry, artillery, wizards, priests, inquisitors, engineers.
What will change are names: no more Sigmar, Karl Franz..., Averland, Nuln..., runefang, hurricanum..., or familiar lores and spell's names.