People are talking about it. I have said myself in my monthly column:

"Personally I am very thrilled to have tools available that can express uncertainties in planning (e.g. LiquidPlanner.com). The trick is to provide range estimations, for example. Instead of stating that something is finished on date A, you provide a range, between date A and B. The wider the range, the higher the uncertainty of that particular task. For a PM it is a gift from heaven. You can communicate your uncertainty. Death to the one dimensional Gantt chart. Hail to the multi-dimensional Uncertainty Based Multi Range Task Chart!"

I will be posting more detailed information, but for now, check out this movie about LiquidPlanner.com.