I suppose my thinking on this is to release smaller packs for free, and then expand those packs into Supporter Versions that include additional content and variations. Kind of like what I did with the Citizens packs. It gives some people a chance to test out the assets and then choose whether or not they wish to support me by buying the expanded version pack :)
The Creatures will get an exanded Supporter Pack version too, with differently armed/geared Orcs, Goblins, and Skellies. (ie, Skelly Archers, Goblin Slingers, Heavy Armored Orcs, etc...)