  We discuss how the latest data on X(3872) in B and B_s decays speak about its
tetraquark nature. The established decay pattern, including the up to date
observations by CMS, are explained by the mixing of two quasi-degenerate,
unresolvable, neutral states. The same mechanism also explains isospin
violations in X decays and strongly suggests that the lurking charged partners
are required to have very small branching fractions in J/psi rho^pm, well below
the current experimental limits. In addition, a new prediction on the decay
into J/psi omega final states is attained. The newest experimental observations
are found to give thrust to the simplest tetraquark picture and call for a
definitive, in-depth study of final states with charged rho mesons.
