Before revision:  In passing we show (i) that the small-maturity exploding behaviour of forward smiles depends on whether the quadratic variation of the underlying is bounded or not, and (ii) that the forward-start date also has to be rescaled in order to obtain non-trivial small-maturity asymptotics  .
After revision:  In passing we show (i) show that the forward-start date also has to be rescaled in order to obtain non-trivial small-maturity asymptotics .