  Important progress made this year, both in theory and in experiment, helped
solving the problem of 2 sigma-deviation from the unitarity of the first row
elements in the CKM matrix. Today we have, |Vus|^2 + |Vud|^2 + |Vub|^2-1 =
-0.0008(13), -0.0010(13), or -0.0005(13), depending on whether the
q^2-dependence of the relevant Kl3 form factor is considered as pole-like,
linear or quadratic function, and on the Leutwyler-Roos value of
f+(0)=0.961(8), whose validity has recently been reinforced by lattice studies.
In this talk we summarize the recent developments.
