Click to Enlarge.
The K-z has a maximum of 120 millions of colour combinations whilst the K-s has 480. But then the K-s has 20 body colours while the K-z has only 12. The K-z, if it is true, is obviously re-using the K-r body, as what can be seen.
On the other hand, some people from Europe told me that this camera would be called K-300 instead of K-z, which is no good for German, AFAIK.
Unless this is a hoax, everything should be true but yet (previously) undecided, IMHO.