That's... that's really, REALLY cool. I can imagine a lot of cases where volumetric simulations may be useful: from someone getting up from a sofa with the cushions recovering their shape to various cases of squeezing (choking someone, squeezing a tube paste, throwing a water balloon--sans explosion). The functionality certainly appeals to me, and I am sure that users more skilled than I would make stunning images and animations with it.

Also, it is one of the few things the Optitex plugin has that VWD doesn't, so it may be nice to put the final nail in the coffin