Rapid advances in superconducting detector technology and readout electronics are enabling a new generation of significantly more sensitive measurements of the polarization of the cosmic microwave background. These measurements will provide constraints on inflation, the nature of neutrinos, and a broad range of astrophysical topics. To begin realizing these scientific goals, I have recently deployed a new experiment, called SPT-3G, on the 10m South Pole Telescope. I will describe the technology development, commissioning, and preliminary data from this experiment, as well as some of the scientific opportunities of its rich dataset. I will also discuss the next generation of experiments, such as CMB-S4, which will continue this path of technology development and ever increasing sensitivity.