$\mathrm{\Omega }(2012)$ through the looking glass of flavour SU(3)

We perform the flavour $SU(3)$ analysis of the recently discovered $\mathrm{\Omega }(2012)$ hyperon. We find that well known (four star) $\mathrm{\Delta }(1700)$ resonance with quantum numbers of $J^P=3\mathrm{/}{2}^{-}$ is a good candidate for the decuplet partner of $\mathrm{\Omega }(2012)$ if the branching for the three-body decays of the latter is not too large $\le 70$%. That implies that the quantum numbers of $\mathrm{\Omega }(2012)$ are $I(J^P)=0(3\mathrm{/}{2}^{-})$. The predictions for the properties of still missing $\mathrm{\Sigma }$ and $\mathrm{\Xi }$ decuplet members are made. We also discuss the implications of the $\bar{K}\mathrm{\Xi }(1530)$ molecular picture of $\mathrm{\Omega }(2012)$. Crucial experimental tests to distinguish various pictures of $\mathrm{\Omega }(2012)$ are suggested.