I'm writing my master's thesis on exactly that topic. http://control.ee.ethz.ch/index.cgi?page=sada;action=details...

a) a heuristic for optimal routing of repositioning trucks based on anticipated (uncertain) future demand.

b) dynamic pricing using a model predictive control approach (receding horizon optimization on a model of customer reaction to (price) incentives).

Insanely cool stuff. And its working. A paper should come out soon..