So guys get this you have the whole of the old world to play in and explore you can choose to start as any of the factions and you get a playstyle/backstory to match like you do in Bannerlord. You can go around city to city picking up missions and recruiting mercs as a human. You can get yir' boyz and join da waagh as an orc. Raid the entire world on your longship as a Norseman. The lore and setting is absolutely perfect for it.
It'd even fit for when you want to strike out and start your own kingdom because everyone in Warhammer is a bunch of backstabbing POS'
They could even have a system of spells for if you want to play as a wizard, or a mutation modifier if you're a chaos worshipper. The possibilities are endless.