They could be prototype wheels. I doubt they'd put wheels you can buy on a concept, it's just not usually done.
I don't find the six-spokes attractive myself. And the price is likely high.
In general, with wheels you want either five or seven spokes. An odd number of spokes looks more dynamic than an even number. But three spokes looks funny, and more than seven gets crowded and loses a sporty edge. It also helps if the spokes taper, as they do with the seven-spoke designs but not so much with the six.
Get any suitably elegant 5 or 7 spoke 21-inch wheels on the Enclave, and it'll look hot.