According to Motorcyclists Online, it's a prototype and it's called the Café Racer Super Naked.
More information to follow soon hopefully but for now here's some images.
Update 01/02/08: Here's some info from Starck's office:
"VOXAN the exclusive and unique French motorbike brand presents its new extreme vision of the café racer. With the “super naked Xv”, Voxan by Starck. Raw power enhanced by the radical purity of the minimalism. The absolute essence of the motorcycle. 1200 cm ³. 140 horsepower 180 kg. Order on internet. Available beginning last quarter 2007."
Photographs by Thomas Duval.