  The recent measurements of the B_s meson mixing amplitude by CDF and of the
leptonic branching fraction BR(B to tau nu) by Belle call for an upgraded
analysis of the Unitarity Triangle in the Standard Model. Besides improving the
previous constraints on the parameters of the CKM matrix, these new
measurements, combined with the recent determinations of the angles alpha, beta
and gamma from non-leptonic decays, allow, in the Standard Model, a quite
accurate extraction of the values of the hadronic matrix elements relevant for
K-Kbar and B_{s,d}-B_{s,d}bar mixing and of the leptonic decay constant f_B.
These values, obtained ``experimentally'', can then be compared with the
theoretical predictions, mainly from lattice QCD. In this paper we upgrade the
UT fit, we determine from the data the kaon B-parameter B_Khat, the B^0 mixing
amplitude parameters f_Bs B^{1/2}_Bs and xi, the decay constant f_B, and make a
comparison of the obtained values with lattice predictions. We also discuss the
different determinations of V_ub and show that current data do not favour the
value measured in inclusive decays.
