I have seen pics of used sorentos with a chrome 17" wheel, I can tell you that it did not come from KIA like that. It was added later, most likely at the original dealer. Like an upgrade package they do there, the 17" 7 spoke from the factory are silver painted, the 18's are either silver painted or chrome plated.
Looks like a chrome covered hubcap that fits right over the polished aluminum wheel. Interesting as I have these wheels and have never seen this before. If the vehicle is brand new then it may have been a dealer upgrade or something. It looks pretty good for hubcaps though.