Some of the things I tried and thought were great additions to the battle system:
This Siege pre-battle deployment UI is fantastic, it allows us to assign leaders to the troops. I don't know exactly how it translates into the battle, but I think it's a great addition.
Also the menu to create "squads" is also a very welcome addition, even the little thing such as in addition to the percentages, they added how many actual troops are in each group! Little things that make your life easier, enjoy the game instead of grabbing a calculator and doing percentages...LoL.
I'd love to hear from someone with more experience or who used them a bunch of time to explain how they actually work, for instance the bottom right button, the top button with a sword or bow...etc.
Once the settlement is stormed, this is the menu you get to choose for the storming of the keep, the "enemy's last stand".
Which is again a fantastic idea, here one can select his/her companions and/or units that need upgrading and storm the keep.
Overall, this has been an excellent update.