  The Belle-II experiment has recently measured $\mathcal{B}(B^+\to
K^+\nu\bar{\nu})$, which appears to be almost $3\sigma$ larger than its
Standard Model (SM) prediction. In this talk, I will critically revisit the
status of the SM predictions for the $B\to K^{(\ast)}\nu\bar{\nu}$ decays, and
discuss the interpretation of the recent Belle-II measurement in terms of a
general Effective Field Theory, as well as concrete models of physics beyond
the SM.
