Upgrades of the CMS pixel detector for the HL-LHC

In 2023, the LHC will be upgraded to the HL-LHC, increasing the luminosity to 5 x 10\textsuperscript{34} cm\textsuperscript{-2}~s\textsuperscript{-1}. The increased luminosity will present new challenges, such as higher data rates and increased radiation. The CMS Phase 2 Pixel upgrade will require a high bandwidth readout system and high radiation tolerance for sensors and on-detector ASICs. Several technologies for the upgrade sensors are being considered, including thin planar and 3D options. DC-DC conversion or serial powering schemes are under consideration to accommodate significant constraints on the system. These prospective designs, as well as new layout geometries that include very forward pixel disks, will be presented.