Will we be able to split up the levies? Like, in order to force-march cavalry units from a further away region in order to bolster an army on the front faster? Because I can see how that would cause problems both ways, with the system described here. If you can, then what's stopping players from just stripping units away from the armies of less martially-inclined governers and rending this change to just an annoyance? And if not, then suddenly army composition is going to be a whole lot more tedious to deal with, and it's going to make some nations downright impossible to play without relying heavily on save-scumming more than they already do. (And it also nerfs my opening strategy of putting my ruler on a horse and just razing every city I can get to, then hiring mercs to pick up the slack. So that's annoying.)
Further, have you guys put any thought to expanding what these new armies actually accomplish? Because while taking slaves is great and all, and stealing artifacts is hilarious when you can manage it, we're still really limited in terms of what war actually accomplishes.