The Japanese site burner-images.com has few more pictures of concept Nikon DSLR cameras:
The text on the black label from one of the pictures is the same as the text in my previous post:
「全てニコン デザイン部からの提案モデルです」
All proposed models from Nikon’s design department
「将来を見据えての検討過程から生まれたコンセプトデザインです」
They are all concept designs having considered future speculations
「商品化の予定はございません」
No plans to commercialise
Thanks to everybody that sent translations/info/links.