It doesn't show any new unit skins or anything. What could be wrong?

It seems to work fine to me. Be aware that EDU is quite subtle and that units not always have different unit art. The easiest way to check is to start as an African civ and check if you start with black units, instead of with units from the BTS middle-eastern unitartstyle.

The settler is one way to tell you will have more units in the group. If its unique art your looking for check Mamba's Diversica for WoC, here, http://forums.civfanatics.com/downloads.php?do=file&id=9967.