Overview of map changes coming with the patch outside of the Nanman territories by SeriousTrivia (great channel):



Lots of fixes to commandery names, addition of settlement and county names so that you're no longer fighting the battle of "Chen - Farmland." Some other additions, such as Xiapi, Jiuzhen, and Liaodong, and some changing of commandery shapes and movement of resources.

Addition of passes. Most are historical, but Hulao Pass wouldn't be called that for quite some time. I believe it was called Xuanmen Pass during this era. It's also in the wrong place, but CA have acknowledged this and said they'll fix it on the next expansion patch. Jiameng Pass is also an anachronism of the Romance, based off the real Jianmen pass that stood between Hanzhong and the Sichuan basin where Jiang Wei historically made his final stand.

New impassable or difficult terrain around the mountains to make them more defensible, and shallows around Chang'an to prevent it from being attacked over and over from the river.