sorry, what do you mean by "premium versions"?
while patrons do get to play each new release up to a month before everyone else, the only in-game difference between the public version and the patreon one is the x-ray level. but content wise, you're not missing out on anything!
and if you're specifically referring to the full nude x-ray, the plan as far as i'm aware is to eventually turn it into an actual item that you'll acquire at some point in the story — the way we have it right now is just a placeholder gimmick until we figure things out