The interplay between flavour symmetries connecting Bs \to KK decays with the recently measured Bd \to K0 {\bar K}0 decay and QCD Factorisation opens new strategies to describe the decays Bs \to K0 {\bar K}0 and Bs \to K+ K- in the SM and in supersymmetry. A new relation, emerging from the sum-rule for the Bs \to K0 {\bar K}0 decay mode, is presented offering a new way to determine the weak mixing angle \phi s of the Bs system.
PACS numbers: 13.25.Hw, 11.30.Er, 11.30.Hv, 12.39.St
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