Fake? No.
The pictures of the case were taken at the IFA consumer electronics trade show in Berlin, which opened on the 29th.
Hama is a German manufacturer of CE accessories and they've let the cat out of the bag by including their case for the new Nano in their booth display. Intentional or not, information about future developments do come out of trade shows.
It's not the first time an entity that should reside behind the wall of NDA has come out on the other side.
Something is brewing at Apple. I have a close relationship with a few Apple stores and they are "changing" something at the store. Of course they won't say but there was a hint of "check the site tomorrow." I hope they are right. Because the iPhone is getting tiresome. Could the new nano be published on the site tomorrow? Oh the waiting........