I think that the variety in the Arks will definitely be a thing, based on what I'm seeing come through thus far from folks.
Here's a post that has the first Ark in it (up to the point of final render in Maya, but pre-PBR edits):
https://www.kickstarter.com/projects/arcengames/ai-war-ii-0/posts/2033678Regarding having the Ark abilities and Ark visuals be separate... I'm not sure how I feel about that. I kind of feel like that would kill the unique personalities that they have? It's kind of like if in Overwatch you could have whatever character visuals mixed with whatever character abilities? To me, they kind of go hand in hand. It doesn't HAVE to be that way, but that's just how I tend to think of it. Somehow that grounds me more in "this is a tangible thing, not just a skin," if that makes sense?