Probably the biggest one was support for modding. That's a pretty big effort though.
The one I was hoping made it in at some point was battle environments with context. So, dungeons, ruins, fortresses, towns and the like. So, if you attack a ruin, your battle won't happen in an open forest. They did some mockups before they dropped it:
There was other stuff, such as adding support units for your army that wouldn't fight but provide services, equipment and support (blacksmiths, healers and the like).
They were also going to add more unique items to the game as well as "battle sisters" with unique backgrounds.
There's other stuff related to combat like mounts and yet other stuff I'm probably not remembering.