Im sure this will be nice for the modders to play with as well
im not specifically sure about race armours since what i seen was on a nord and imperial which are both similar in appearance thus the armours were also.
from the variations i see no reason for there not to be multiple weight classes of dragon armour as well as dwemer, although that's my own opinion i have no proof. As for the steel there most defiantly is different styles just not sure if they fall under heavy or light classes, im pretty sure i saw a type of "mail" under the steel category but its weight class im unsure of, sorry.
yep i can see the modders having a easy time when it comes to making more armours, i mean from what iv seen it is a massive improvement over the other tes games, even in look and detail.