Since it looks like Bretonnia is the next Old World race to get a rework, i have a simple suggestion to add flavour to their gameplay:
Add a new "Prayer" stance, which would require 50% movement to activate and deny any further movement for the turn, and it would grant the blessing of the lady to the army, lasting only until the following turn, like the lizardmen's astromancy stance.
Thematically this reflects the Bretonnians praying for the lady to help them before a tough battle, and it also reflects the tabletop, where Bretonnia could choose not to go first and pray instead, giving their army (or maybe only their knights) an additional save.
In gameplay terms this stance could be very useful if you expect a hard fight in the next turn, and if you're under siege. Maybe the stance could even grant a small replenishment boost.
Stating opinions as if they're facts in your signature and adding "Change my mind" doesn't make them facts, change my mind.