  The CMS inner pixel detector system is planned to be replaced during the
first phase of the LHC luminosity upgrade. The plans foresee an ultra low mass
system with four barrel layers and three disks on either end. With the expected
increase in particle rates, the electronic readout chain will be changed for
fast digital signals. An overview of the envisaged design options for the
upgraded CMS pixel detector is given, as well as estimates of the tracking and
vertexing performance.
