B-Physics at CMS with LHC Run-II and Beyond

The LHC is entering into operation with an increased centre-of-mass energy of 13~TeV, and within the next 3 years of operations (Run-II) the foreseen integrated luminosity delivered to CMS will be about 100 fb$^{-1}$. The B hadron production cross section is expected to nearly double at this energy, thus potentially increasing by almost one order of magnitude the collected statistics relative to the previous operation period. This will enable CMS to perform enhanced measurements in the B-physics sector. A further increase in integrated luminosity is expected to occur in two more steps after the second LHC long shutdown (LS) in 2018 and the third LS in 2021, thus enabling to significantly improve the precision of several B-physics measurements, including $B_s(B_d)\to\mu^+\mu^-$, and search for rarer decays. This proceeding reports on the prospects for B-physics measurements with high statistics data at CMS.