  A new pixel detector for the CMS experiment is being built, owing to the
instantaneous luminosities anticipated for the Phase I Upgrade of the LHC. The
new CMS pixel detector provides four-hit tracking while featuring a
significantly reduced material budget as well as new cooling and powering
schemes. A new front-end readout chip mitigates buffering and bandwidth
limitations, and comprises a low-threshold comparator. These improvements allow
the new pixel detector to sustain and improve the efficiency of the current
pixel tracker at the increased requirements imposed by high luminosities and
pile-up. This contribution gives an overview of the design of the upgraded
pixel detector and the status of the upgrade project, and presents test beam
performance measurements of the production read-out chip.
