  The suppression of quarkonium production in nucleus-nucleus collisions was
originally proposed as a signal of colour deconfinement. Strong ``anomalous"
J/\psi suppression in Pb-Pb collisions has been reported at this Conference by
the NA50 Collaboration. Is this suppression really anomalous? Can we conclude
that the quark-gluon plasma is already discovered? What has to be done next? I
address these questions basing on the current theoretical understanding of
quarkonium production and new precise experimental information.
