  Recently, a more than 2sigma discrepancy has been observed between the well
measured inclusive value of Vub and the predicted value of Vub from the
unitarity triangle fit using the world average value of sin2beta. We attempt to
resolve this tension in the context of grand unified SO(10) and SU(5) models
where the neutrino mixing matrix is responsible for flavor changing neutral
current at the weak scale and the models with non-proportional A-terms (can be
realized simply in the context of intersecting D-brane models) and investigate
the interplay between the constraints arising from B_{s,d}-\bar B_{s,d}
mixings, epsilon_K, Br(tau -> mu gamma), Br(mu -> e gamma) and a fit of this
new discrepancy. We also show that the ongoing measurement of the phase of Bs
mixing will be able to identify the grand unified model. The measurement of
Br(tau -> e gamma) will also be able to test these scenarios, especially the
models with non-proportional A-terms.
