  In a previous paper [1], we presented a three-flavour oscillation analysis of
the solar neutrino measurements and of the first data from the KamLAND
experiment, in terms of the relevant mass-mixing parameters (delta m^2,
theta_12, theta_13). The analysis, performed by including the terrestrial
neutrino constraints coming from the CHOOZ (reactor), KEK-to-Kamioka (K2K,
accelerator) and Super-Kamiokande (SK, atmospheric) experiments, provided a
stringent upper limit on theta_13, namely, sin^2(theta_13)<0.05 at 3 sigma. We
reexamine such upper bound in the light of a recent (although preliminary)
reanalysis of atmospheric neutrino data performed by the SK collaboration,
which seems to shift the preferred value of the largest neutrino square mass
difference Delta m^2 downwards. By taking the results of the SK official
reanalysis at face value, and by repeating the analysis in [1] with such a new
input, we find that the upper bound on theta_{13} is somewhat relaxed:
sin^2(theta_13)<0.067 at 3 sigma. Related phenomenological issues are briefly
discussed.
