  CP-violating effects in decays of B mesons offer a wide spectrum of probes
for testing the phase structure of the quark-flavour sector of the Standard
Model. After a brief discussion of the picture emerging from the current LHC
data, the focus will be put on two specific topics: hadronic uncertainties from
penguin topologies on measurements of the $B^0_q$-$\bar B^0_q$ mixing phases
($q\in\{d,s\}$), and the U-spin-related decays $B^0_s\to K^+K^-$ and
$B^0_d\to\pi^+\pi^-$. Valuable new insights are expected from future studies of
CP violation in B decays. For the detection of possible new sources of CP
violation, it will be crucial to match the experimental and theoretical
precisions and to have a careful look at the underlying assumptions.
