Support for the Pleiades sensor was added to our software in Geomatica 2012. We currently support Level 1A and Level 2 data. If you are working inside of OrthoEngine please note that you will only be able to use Pleaides Level 1 data. This type of data includes a DIM*.xml (metadata) and RPC*.xml (rational function model) files.
Please see our supported sensor list here: http://www.pcigeomatics.com/resources/geomatica/sensor-support