We came across that prototype frame on Facebook. It's called Claybom and will be available through Insideout Garage. As you can see it's a classic design with a bent downtube. The top tube is 19" long and chain stay 13". As they write on Facebook it's designed for the taller riders out there. It comes with head tube angle of 75° and the prototype weighs 1980g = 4.3 lbs. The frames will be available about 1 or 2 months.