Well I thought the press may have got a hands on yesterday. I did manage to find this: http://www.slashgear.com/iphone-5s-and-5c-cases-hands-on-made-by-apple-10297394/Isn't released until the 20th, unfortunately.
And...
"I also played with the leather cases on the iPhone 5S which come in a variety of colors. These are also suede lined inside and feel rigid, and I was told these are actual leather as well."
http://www.anandtech.com/show/7311/hands-on-with-the-new-iphone-5s