  Some discrepancies between theory and experiment in the B -> pi K decays
suggest the possibility of a new physics contribution with the structure of an
electroweak penguin amplitude. If such a scenario is realised in nature, the
branching ratios of the decays B_s -> phi pi and B_s -> phi rho can be enhanced
by about one order of magnitude. We review and update the current status of the
B -> pi K puzzle and its implications for the decays B_s -> phi pi and B_s ->
phi rho.
