  The recent analyses of the world neutrino data, including the T2K and MINOS
results, point toward a statistically significant deviation of theta13 from
zero. In this paper we present a SUSY SU(5) model based on the discrete S4
group which predicts a large theta13 of order lambdaC, lambdaC being the
Cabibbo angle. The other mixing angles in the neutrino sector are all
compatible with current experimental data. In the quark sector, the entries of
the CKM mixing matrix as well as the mass hierarchies in both up and down quark
sectors are well reproduced and only a small enhancement is needed to reproduce
lambdaC.
