  The fixed-target NA61/SHINE experiment (SPS CERN) looks for the critical
point of strongly interacting matter and the properties of the onset of
deconfinement. It is a two dimensional scan of measurements of particle spectra
and fluctuations in proton-proton, proton-nucleus and nucleus-nucleus
interactions as a function of collision energy and system size, corresponding
to a two dimensional phase diagram (temperature T - baryonic chemical potential
$\mu_B$). New NA61/SHINE results are presented here, such as transverse
momentum and multiplicity fluctuations in Ar+Sc collisions compared to
NA61/SHINE p+p and Be+Be data, as well as to earlier NA49 A+A results.
Recently, a preliminary signature for the new size dependent effect - rapid
changes in system size dependence was observed in NA61-SHINE data, labeled as
percolation threshold or onset of fireball. This would be closely related to
the vicinity of the hadronic phase transition region.
