This is what I found out there, quoted from a web page: How would you like a 2.2lb mountain bike frame? No, we're not talking about Titanium, but Easton's latest alloy they call Scandium. The bike is the Voodoo Sobo. Voodoo is a small bike manufacturer in Southern California who has produced a big hit with the Sobo. 2.2 lbs....WOW!! My bike is a tank, but so am I!! LOL!! Voodoo Sobo XC Frame - $775.00 - Bike Parts 360
Yeah, that's been around for a while. My ride was the Voodoo Hoodoo about 7 years ago. Loved it and it was light for a CroMo. Still have the frame always wanting to make it into a commuter. Never heard of anyone getting the Sobo and verifying the weight or ride.
Never heard of that one. I'm fairly certain that my Mt Fuji Pro frame is under 3 pounds. It's all carbon. Don't know exact number though.