  Deconfinement refers to the creation of a state of quasi-free quarks and
gluons in strongly interacting matter. Model predictions and experimental
evidence for the onset of deconfinement in nucleus-nucleus collisions were
discussed in our first review on this subject. These results motivated further
experimental and theoretical studies. This review addresses two subjects.
First, a summary of the past, present and future experimental programmes
related to discovery and study of properties of the onset of deconfinement are
%briefly presented. Second, recent progress is reviewed on analysis methods and
preliminary experimental results for new strongly intensive fluctuation
measures are discussed, which are relevant for current and future studies of
the onset of deconfinement and searches for the critical point of strongly
interacting matter
