  Measurements of disoriented chiral condensates in heavy ion collisions at
RHIC and the LHC can yield fundamental information on the nature of the QCD
phase transition. I review theoretical efforts to understand the evolution of
the condensate and present new results on experimental signals in the single
pion spectrum and in pion interferometry. (Invited talk at the Third
International Workshop on Relativistic Aspects of Nuclear Physics, Rio de
Janeiro.)
