This has been a big year for neutrino physics. First, results came out from Daya Bay and the RENO collaboration providing new bounds for the value of the element of the PMNS matrix. Now, the EXO-200 collaboration have revealed that no neutrinoless double-beta decays have been observed, an indication that neutrinos are more than likely Dirac fermions rather than Majorana fermions.
Of course, more data will need to be collected before this can be considered a solid result. Plans are already in the works to increase the volume of the Xenon detector used in the experiment.