  We combine available constraints on the local CII 158 $\mu$m line luminosity
function from galaxy observations (Hemmati et al. 2017), with the evolution of
the star-formation rate density and the recent CII intensity mapping
measurement in Pullen et al. (2018, assuming detection), to derive the
evolution of the CII luminosity - halo mass relation over $z \sim 0-6$. We
develop convenient fitting forms for the evolution of the CII luminosity - halo
mass relation, and forecast constraints on the CII intensity mapping power
spectrum and its associated uncertainty across redshifts. We predict the
sensitivities to detect the power spectrum for upcoming PIXIE-, STARFIRE-,
EXCLAIM-, CONCERTO-, TIME- and CCAT-p-like surveys, as well as possible future
intensity mapping observations with the ALMA facility.
