  Some theoretical aspects of $B$ physics are reviewed. These include a brief
recapitulation of information on weak quark transitions as described by the
Cabibbo-Kobayashi-Maskawa (CKM) matrix, a description of CP asymmetries in $B$
decays to CP eigenstates and self-tagging modes, a discussion of final-state
phases in $B$ and charm decays, some topics on $B_s$ properties and decays, the
prospects for unusual excited $B$ states opened by discovery of some narrow $c
\bar s$ resonances, and the prospects for seeing the heavier $Q=1/3$ quarks
predicted in some extended grand unified theories.
