Well I guess you could say its announced now. It does work really well, I wrote my own velocity tracker first by dividing the difference between mouse position angles by the difference in mouseevent's timestamps. But I found the Velocitytracker more robust. One issue I did notice is that when I then used 'auto' velocity the min and max values seems to be ignored. I solved by using my own min/max e.g.
// min, max ignored
ThrowPropsPlugin.to(dial, {throwProps: {rotation: 'auto', resistance: 10, min:-300, max:300}});
// custom min/max
var v = Math.min(300, Math.max(ThrowPropsPlugin.getVelocity(dial, "rotation"), -300));
ThrowPropsPlugin.to(dial, {throwProps: {rotation: v, resistance: 10}});