The guy with superlight bikes has built a new one. A Storck Rebel Seven 27,5″ with Sram XX1 and Storcks superlight crankset (made by THM Carbones)
Schmolke bar and seatpost. Tune saddle, stem and QR. Magura MT8 brakes.
Rock Shox SID World Cup fork and the supercool Bike Ahead Composites wheelset, clincher with Schwalbe Rocket Ron.
Total weight is: 7,8kg
More info and pictures on his blog: Emanuel Schicher