I like the models, for sure. I also totally get the Cadian look to everything--they look the most like what ordinary future soldiers "should" look like, anyway. I've always interpreted those guys as being more generic than exclusively Cadian. It is a little dumb that they went to all that trouble to blow Cadia up but then put Cadians all over their next codex anyway.
Given what the rules sound like, it seems that everything is going to be a custom regiment, anyway. No more *just* Cadians or Catachans or Vostroyans or whatever. Fine by me, though I can't see myself mix-matching my infantry that much. It would look terrible.