I would like an update on the menus, such as being able to see friends online.
An update of the pre-TAR natives could also be expected. With improvements in their current technologies and units, and why not, more new technologies and units.
A rework to European cattle would be nice.
An overall improvement to revs.
New minor factions for South America such as the Muiscas, and maybe a new royal house for Europe.
Naval and fluvial trade routes for the American and Asian continents. (Even lacking this type of trade route).
Improvements on old cards that are rarely used due to not being viable.