  In spring 2012 CERN provided two weeks of a short bunch proton beam dedicated
to the neutrino velocity measurement over a distance of 730 km. The OPERA
neutrino experiment at the underground Gran Sasso Laboratory used an upgraded
setup compared to the 2011 measurements, improving the measurement time
accuracy. An independent timing system based on the Resistive Plate Chambers
was exploited providing a time accuracy of $\sim$1 ns. Neutrino and
anti-neutrino contributions were separated using the information provided by
the OPERA magnetic spectrometers. The new analysis profited from the precision
geodesy measurements of the neutrino baseline and of the CNGS/LNGS clock
synchronization. The neutrino arrival time with respect to the one computed
assuming the speed of light in vacuum is found to be $\delta t_\nu \equiv TOF_c
- TOF_\nu= (0.6 \pm 0.4\ (stat.) \pm 3.0\ (syst.))$ ns and $\delta
t_{\bar{\nu}} \equiv TOF_c - TOF_{\bar{\nu}} = (1.7 \pm 1.4\ (stat.) \pm 3.1\
(syst.))$ ns for $\nu_{\mu}$ and $\bar{\nu}_{\mu}$, respectively. This
corresponds to a limit on the muon neutrino velocity with respect to the speed
of light of $-1.8 \times 10^{-6} < (v_{\nu}-c)/c < 2.3 \times 10^{-6}$ at 90%
C.L. This new measurement confirms with higher accuracy the revised OPERA
result.
