Seems like little more than a clever way for them to dump their massive holdings. The question I'd be asking is, why are they exiting Bitcoin? Maybe they see the writing on the wall?
Your thinking very short term here, the people that get involved with things like this (i.e. the winkelvii) aren't looking to exit a possible 100 billion or trillion usd venture for a mere 1000% ROI.
bitcoin is the first p2p digital currency (that I know of) that has gained this much traction and attention capable of possibly disrupting the worlds financial industry and breaking the monopoly of the fed and other world banks.
People like the winklevii don't lose, even when they lose they win, i.e. the facebook lawsuit.