http://thenextweb.com/google/2013/03/12/google-x-lab-will-reveal-another-moonshot-next-month-but-its-not-working-on-a-space-elevator/
I'll take a wild stab:
I think it could be related to bitcoin, an alternative chain. It would be advantageous to be able to control the amount of coins in existence such that the exchange rate is stable. Thus the software could simply multiply everyones coins by a floating-point multiplier depending on the current exchange rate. In essence a currency governor. This seems a really simple problem in control systems theory.
Anyone else want to speculate?