  We report the discovery of four new pulsating subdwarf B (sdBV) stars from
Campaign 7 of the Kepler spacecraft's K2 mission. EPICs 215776487, 217280630,
218366972, and 218717602 are all gravity (g)-mode pulsators and we also detect
two pressure (p)-mode pulsations in EPIC 218717602. We detect asymptotic l=1
sequences in all four stars, allowing us to identify nearly all of the g modes.
We detect evenly-spaced frequency multiplets in EPIC 218717602, from which we
determine a rotation period near seven days. Spectroscopic observations
determine that EPIC 218366972, is in a 5.92d binary with most likely a white
dwarf companion of canonical mass while the others have no detected companions.
As we detect no multiplets in EPIC 218366972, it is added to the growing list
of subsynchronously rotating stars. With 40 Kepler-detected sdBV stars and a
growing number of TESS publications, we update an examination of the group
properties to provide direction for models. We notice a correlation between
effective temperature and period of maximum pulsation amplitude, at least for
g-mode pulsations, and update the previously-observed effective
temperature-rotation period relation.
