Electromagnetic probes of strongly interacting matter: probes of chiral symmetry restoration?

The QCD sum rule approach to in-medium modifications of the ω meson in nuclear matter is reviewed with emphasis of its relation to 4-quark condensates and chiral symmetry restoration. Possible implications of the CBTAPS experiment for the reaction γA → A′ω(→ π0γ) are sketched and the particularly important role of di-electron probes, accessible with HADES, is highlighted. A brief update of a parametrization of the previous dilepton and photon probes from CERES and WA98 of heavy-ion collisions at CERN-SPS energies is presented.