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