Hello!  First off, I adore the new unit icons that have more cultural variety than the original ones!  Having Spearmen that aren't Mesopotamian and Knights that aren't European is a great visual addition.

That said, unit icons seem to be represented using different logic from unit models, which leads to some odd combinations.  From what I can tell, unit models seem to be "locked in" in to your culture when you earn the unit, but the unit icons change to match your current culture.  For example, your Classical Era Greek Swordsmen will always look like Greek Swordsmen on the map, as you advance through the ages, but if you chose the Aztec as your Medieval culture, those Greek Swordsmen will be represented with an Aztec Swordsman icon.

This can lead to some strange and jarring combinations, like when choosing the Haudenosaunee after having used exclusively "Old World" cultures up to that point:  While my early-era units keep the same models as they did before, my unit icons are replaced by the colourful icons given to the "New World" Olmecs, Maya, and Aztec.  However, Haudenosaunee culture is not closely related to Mesoamerican culture and shouldn't take on the icons of these earlier cultures.

I understand the reasoning for the "Americas/New World" units to fall into an icon grouping — similar groupings are present with African, European, and Asian cultures, with some minor regional differences — but some of these combinations are odd.  When a culture like the Haudenosaunee have no earlier "in-game predecessor", the updated icons can seem ill-informed.

Suggested fix:  Unit icons should "lock in" with the culture appropriate to the unit's era using the same logic as the unit model, and not change as you change your culture.  For example, if I move through the cultures from Zhou to Mauryan to Norsemen to Haudenosaunee, my Scouts and Warriors could look Zhou, my Swordsmen would be Mauryan, my Knights Norse, and my Halberdiers Haudenosaunee.