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How accurate is Implied Volatility in predicting future moves?
A change in implied volatility tells us something about what investors are thinking (or fearing) about the volatility going forward for the life of the associated option contracts (which may be short or long-lived).  IV does a good job of summarizing the information available to investors, which includes information about the past and the present. However, whether these investor views actually translate into what happens in the future is a topic of debate in the finance literature--investors do not generally know the future--there are conflicting results available.  There have been papers that show that implied volatility has predictive power in some situations, time periods, and horizons (though it is also biased) and other papers that show that it does not have statistically significant predictive power at all. The consensus last time I checked was that implied volatility is no worse than historical volatility (including methods that use trends in historical volatility to forecast where it is going) at predicting future volatility.  Whether it is significantly better and whether either reliably predicts the future is something that is not agreed on.  I take this lack of consensus as evidence that if it does predict future volatility, it does so poorly. Somewhat dated FAJ survey on the subject