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Millimeter-wavelength cosmological surveys require focal planes with increasingly vast numbers of detectors in order to access new science using the CMB and emerging probes such as mm-wave line intensity mapping (LIM). Highly multiplexed kinetic inductance detectors (KIDs), arrayed as both on-chip spectrometers and wide-band photometers, provide a promising solution to these scaling challenges. I will present two new projects deploying these technologies for observations with the South Pole Telescope. SPT-SLIM is a pathfinder camera to demonstrate LIM with the CO rotational lines using on-chip spectrometers. SPT-3G+ is a camera that will measure the CMB at 220, 285, 345 GHz with diverse science goals spanning reionization history and the patchy kinematic Sunyaev-Zeldovich effect, Rayleigh scattering, and sub-millimeter sources. I will discuss both our ongoing technology development as well as the science targets of these cameras.