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High energy Cosmic rays are a unique window to explore Particle Physics at energies scales well above those reached by Man-made accelerators. This window has been exploited by a new generation of large cosmic rays experiments, namely the Pierre Auger Observatory. Recently, a set of results, some of them not easily explained in the framework of a sudden change in the beam nature and/or of current hadronic interaction models, have been published. Plans for the upgrade of the Auger Observatory at Malargue (Auger 2015) are presently under study. In particular the improvement on muon detection would be a key factor for the study of hadronic interactions at these extreme energies. Such an improvement may be reached using large area, low cost, almost independent from gas supply, and little maintenance, Resistive Plate Chambers (RPCs) which are under development in LIP with very encouraging results.