I doubt that FeralHeart will be having extra models since it's mainly for canines and felines, and to be honest I hope it stays that way because I prefer the simplicity of having only two. All the work that gets put into new models is too much, especially if quality is involved. Rigging, texture, animation etc.. Kov has so much he needs to fix, even the current models' anatomy needs some work done. No, if you want multiple species then waiting for Arokai is your best bet. The name 'FeralAnimals' doesn't really ring the way 'FeralHeart' does.
I don't really understand the terrain idea too much... Less is more. To be honest everything that you've described landscape wise could be easily done if you made your own map. FH will most likely have more official maps in future, such as 'savannahs' and the like are very much a possibility.
Killer Mcguire? I don't know who that is.. And I doubt a city would be transitioned into the FH official maps, simply because it doesn't sit with the 'natural' theme that FeralHeart has.
Overall I'm not sure if your ideas are realistic, but they are creative.