At some point I'll visit them all. The ferals have waited over ten years so far since I first roughed out the ideas for them, but hopefully the timescales on the Eragu and Casanii will be somewhat less.
The Casanii might take a while to appear though - I want to get them right when I eventually visit that region!
My aim with these would be to do a small number of figures for the different races so that you can end up with themed Empire forces with slightly different characteristics. The knights will be fairly ubiquitous, and the standard militia would have a home in most clan forces, but those would be supplemented by characterful units and individuals.