Features include:

New Villager model and textures. 8 common variants, 1 rare ginger variant, and 1 ultra-rare albino variant(+hornless versions of all of them!)
New Zombie Villager model and textures. 3 variants (+hornless versions!)
New Wandering Trader model and textures. 2 variants (+hornless- you get the idea)
New Iron Golem model and textures
New Evoker model and textures. 2 variants
New Evoker Fangs model and textures
New Illusioner model and textures
New Pillager model and textures. 3 variants
New Vindicator model and textures. 3 variants
New Witch model and textures
New Ravager model and texture
8 named Villager variants
8 named Zombie Villager variants
1 named Wandering Trader variant
1 named Evoker variant
2 named Pillager variants
2 named Vindicator variants
1 named Witch variant
Changed Totem of Undying, Spawn Eggs, and 'Humble' painting to match all the new models

Important notes

All Baby Villagers spawn without horns. Unfortunately this means their variant may change when they grow up
I am unable to change the Ominous Banner texture

Named Variants