Studies of CP violation are an important part of the flavour physics program at LHCb and the B factories. In this talk, I will present a selected overview of recent theoretical developments in this field where the theoretical challenge is to control the uncertainties from strong interactions to disentangle between the Standard Model and possible New Physics effects. In particular, I discuss the semileptonic asymmetry $a_{\text{sl}}^s$, the CKM angle $\gamma$, and the $B_d^0$ and $B_s^0$ mixing phases. A newly found puzzle in the $B \to \pi K$ system is highlighted. Finally, the recent progress to describe three-body $B$ decays in QCD factorization is discussed.