Guaranteed that this will just be a map of China. They probably won't have the Xinjiang city-states, nor the steppe, nor anything in Indochina, heck it probably won't even have Korea.
The game also won't have anything meaningful in the way of approaching the economic factors of the period. Researching Agro-Military colonies on some tech tree will be enough instead of actually being able to create fortified colonies to increase taxation of devastated areas as well as to increase the number of men you can call up for military service.
There will probably be 2 cities per province instead of the more complex county system which China actually used. In addition to that historical fortresses will probably be non-existent, places such as Xiaoting, Hefei or Xiangyang.
Cao Cao will not have the stats or bonuses which he deserves. Historically Cao Cao was a cavalry general who commanded the cavalry forces in the campaigns of Huangfu Song and Zhu Jun. Instead I suspect that someone else like Lu Bu or Gongsun Zan (the White Riders) will have the emphasis on cavalry. This would be regardless of the fact that Lu Bu was actually defeated in a cavalry battle by Cao Cao. However in addition to this Cao Cao was also an infantry general, aside from that specializing in planning operations and strategy, logistics and using his administrative abilities in the form of counter insurgency. For instance he was capable of pacifying the city of Jinan during the Yellow Turban Revolt, getting the various tribes of the north to submit to his rule, creating the Tuntian system (agro-military colonies), getting the Yellow Turbans in Qing Province to join his army and generally being able to avoid peasant revolts.
They will likely give us the option of clicking the raid button, instead of actually raiding.